Most of your questions have been answered fairly well. Just to clear some things up, "GOC" (Genuine Orthodox Church) and "TOC" (Traditional Orthodox Church) are names used by true Orthodox Christians and can refer to the Church at large, or any of the individual true Orthodox synods. No one synod has the sole claim on the term GOC or TOC, although many synods incorporate these names into the official name of their synods.
These schisms are a sad reality that the Church faces today. We pray in the liturgy of St. Basil for God to quench the schisms of the Church, and I pray for this to happen. Schisms have faced the Church since the earliest times, as we can read in St. Paul's first letter to the Corinthians, although it was not nearly this bad.
The situation has gotten better within the past decade, with synods uniting and reuniting with each other, but it still has a long way to go. I remember hearing a few years ago of two TO churches in America that were not in communion with each other but were located next to each other. After both churches would have liturgy at their churches, they would gather together to share a common meal with each other. And it is not unheard of for laypeople, when traveling or after moving their homes, to attend a TO church that may belong to a different synod not in communion with their own, and still be allowed to receive the sacraments. Again, this is not a perfect situation, but it is not as bad as people try to make it out to be. Many of these TO synods have faced/are still facing persecution from their local governments and from others that belong to the State churches, especially in places like Serbia, Romania, and Greece.
1. What is the difference between HOTCA and HOCNA?
Jah777 answered this question well. The only thing to clear up is that HOTCA is not under the GOC-K; HOTCA is
the GOC-K located in America. When the GOC-K established parishes in America, for legal purposes, they incorporated their name as the Hellenic Orthodox Traditionalist Church in America (HOTCA). But rarely anyone in this synod refers to themselves as "HOTCA." Instead, they refer to their synod as the "GOC-K" or the "GOC" for short, the "K" standing for Archbishop Kallinikos, who is the first hierarch of this synod.
Regarding HOCNA, a few years ago, HOCNA's bishops began teaching a heresy known as "name-worshiping." It is due to this heresy, along with scandals in HOCNAs past, that has led to many of HOCNAs faithful (including priests, monastics, parishes, and even a whole diocese) to leave HOCNA and join the GOC-K in America. And it is due to this heresy that most TO Christians do not view HOCNA as being a TO synod anymore.
4. I hear it also called the metropolia, what is that?
5. where does Metropolitan John of New York fit into this?
The only TO synod I know of that has been referred to as the Metropolia is the synod that I belong to under Metropolitan John of New York. Metropolitan John is not under the GOC-K and is not in communion with the GOC-K. We were granted autonomy by the synod commonly referred to as the Milan synod. The official name given to our synod was the "Autonomous Orthodox Metropolia of North and South America and the British Isles," hence why some have referred to it as the "Metropolia." Unfortunately the Milan synod, after granting us autonomy, broke communion with us and our sister synods in an attempt to unite with the Moscow Patriarchate, therefore leaving true Orthodoxy. After this attempt failed, the Milan synod basically fell apart. I don't know if the Milan synod still exists or not, but I have seen fairly recent pictures of a couple of bishops from the former Milan synod still serving.
from my reading it appears that GOC-K is in communion with Hotca but I am unsure of that. and Metropolitan John of New York is in the GOC-K. basically a little insight and a little history would be great. I am just trying to understand this situation a tad bit better. thanks again team.
There hasn't been much written regarding the history of most TOC synods. HOCNA wrote a book called The Struggle Against Ecumenism
that, although it has a slight HOCNA bias, does a great job explaining the history of the Greek Old Calendarists. It includes many of the historical documents in the appendix too. You can view the order form here: https://docs.google.com/file/d/0BzJKrDVZPwcvUU5IRU53QmtONlE/edit
Deacon Joseph Suaiden of the synod I belong to wrote a book on the history of the Milan synod, as well as our current synod under Metropolitan John of New York, which you can purchase here: http://www.lulu.com/us/en/shop/joseph-suaiden/lux-veritatis-a-history-of-the-autonomous-orthodox-metropolia-of-western-europe-and-the-americas/ebook/product-17480670.html
You can get an insight of the Romanian Old Calendar Church by checking out the life of St. Glicherie here: http://www.hotca.org/pdf/stglicherie.pdf
Or you can or this book which gives the history of the Romanian Old Calendar Church: http://www.ctosonline.org/oldcal/RU.html
The true Orthodox directory for the USA includes links for all of the TOC synods that have a presence in America. It hasn't been updated in awhile (as the Synod in Resistance has now united with the GOC-K) but you can click on the links to any of the synod's websites which will have more information if you're interested: http://trueorthodoxdirectory.us/
Two websites that I have found very useful for the articles that they post are the following, both of which are websites of the GOC-K:http://hotca.org/http://www.hsir.org/index-en.html
To say that many have "lost their minds" trying to figure out the TOC is a gross exaggeration of the matter. Yes, it is not all rainbows and sunshine in the TOC. But most of the faithful that I have met are not focused on the politics of the TOC, or who is in communion with who; rather, most people that I have met are focused on living an Orthodox life and uniting with Christ in His Church.
Also, I do not know of any synod, or group of synods, that claims to be the only TO synod and all the other TO synods as being false, except for Archbishop Gregory of Colorado's synod. Most of the divisions among the different TO synods are due to historical circumstances, misunderstandings, or persecutions. My Metropolitan in the past has had friendly relations with different hierarchs in ROCOR and even attended St. Philaret's glorification. I have visited a monastery of a different TO synod not in communion with my own and prayed with the monks there. I'm not making excuses for the divisions among us since these divisions are a mockery of how the Church is called to be; but rather, I'm trying to portray what the divisions are actually like.