Well, I am no longer Catholic nor Orthodox, but I will give my experience.
I was born into a Protestant (Methodist, but my mother was born a Catholic). To make a long story short, I was accepted into the Catholic church on the Easter Vigil of 2001 (I believe) at the age of 15, after completing RCIA and receivng my parents permission.
As a Catholic, I was the most devoted to God compared to any other time of my life, and would consider my spirituality strongly "Franicscan" with a pinch of "Carmel"; I focused more on writings on interior prayer (specifically the writings of John of the Cross and Teresa of Avila) in the place of formal theology (most of the Christological and Trinitarian debates I knew little about until I delved into Orthodoxy). During the summer I would make it to Daily Mass and during the school year I would go to Eucharistic Adoration after school for about two hours daily. I recited the Rosary around ten times a day (at least 15 decades before the tabernacle daily), as well as the Chaplet of Divine Mercy once per day and, or course, the Stations of the Cross on Friday. Every Saturday I would make it to Confession. If it sounds like I didn't have much of a social life, you guess correctly; but I didn't care too much for a social life at the time since I considered it a waste of time. Due to my love of Francis of Assisi, and a call to the religious life, I was strongly considering the religious life after high school. I was in contact with three Franicscan Orders (all reform Orders): the Franciscans Friars of the Immaculata, the Franciscan Friars of the Renewal, and a reform order which broke away from the Franciscan Friars of the Renewal, the Franciscan Friars of teh Primitive Observance (I was strongly considering this Order before converting to Orthodoxy since I felt they most fathly lived out the Rule of Franics as he originally wanted it to be followed).
When I finally was received into the Orthodox church on my 18th birthday, I had to leave a lot of my "Franciscan" practices behind (Eucharistic adoration, daily reception of the Eucharist, etc.) but I felt I made the right choice leaving the Catholic church for Orthodoxy. To better understand my faith, I joined this website; I have learned much through this forum and the more I learned about Church history and the Christian faith in general, I eventually lost my faith.
I wonder if you are saying your conversion to Orthodoxy is the reason you lost your faith?
I remember being extremely devout as a teenager, too. Not quite to your extent, but religion was my main interest, with the same Franciscan/Carmelite focus as you mention, and I just assumed at some point I'd join a religious order. I never lost my interest, but as I got older, worldly interests began to intrude more. This is not an unusual progression. Unless our childish, literalist faith expands to encompass our growing experience of life, we almost inevitably find it wanting at some point. I'm not suggesting a relativist approach or solution, I'm just saying the simplicity of the "theology" the nuns teach five-year-olds, and that many of us hold on to for many years, doesn't usually do for adults. I never lost my love of Christ or His Mother. What I lost was my confidence in the institution of the church. I felt I was being given answers as though I were still a five-year-old, and I was pretty sure the priest wasn't satisfied with those answers for himself.
My own solution was to keep my heart open to Christ, no matter how scathing my opinions of the churches that claimed to speak in His name. Eventually, I found my way to a church whose priests were not intimidated by my questioning, and who were willing to admit that much about God is simply unknowable by us small human animals, in the sense that we "know" the sun rises in the East. And I had reached a point in my own spiritual evolution where I could embrace the experience of God without having to have an exact explanation of its mechanics. My characterization of the Orthodox church may be at odds with what it says about itself. But its emphasis on mystery, and on entering deeply into the experience of the church's mysteries made it possible for me to join the "body of Christ," and to have the spiritual hunger satisfied that I'd always felt.
Good luck, and God bless you. The path of a spiritual seeker is a difficult and often lonely one.