You were just recently Chrismated, which was a decision to follow Christ. satan attacks and temps people who make the decision to draw closer to God. I think at least part of that is what you are going through. If you wake up in so much pain that you cannot get to church on time, go anyway for at least a little while, even if you are late. Better late than never, as they say. As far as sin goes, that shouldn't keep you away from church, as it is the sinners (like myself) who need church the most. Trust me, you are not surrounded by perfect people when you go to church. They are as sinful as you and I are.
Also, I would imagine that immediately after Chrismation you were probably on something of a "spiritual high." Of course that always eventually goes away and is replaced by the "spiritual blahs," as I like to call it. I know from personal experience that it can be very hard praying and going to church and feeling close to God during those times. You just have to try your best. I recall reading somewhere that a prayer said during the "spiritual blahs" is a greater sacrifice to God than a prayer said during a "spiritual high," since it is so much harder to do. God knows what you are going through. Don't give up. Every Christian goes through this. Even the Desert Fathers went through this. It's very normal. I'll pray for you.
(O.K. everyone: The Desert Fathers had a technical word for the "spiritual blahs" and I can't remember it. What was it? This is going to bother me now.)
Anyway, a good book to read (if you feel like reading) is Beginning to Pray by Fr. Anthony Bloom. Another good one is Being with God, by Pope Shenouda, but that may be harder to find. I just found those helpful.