For what it's worth, when I first started fasting, I did the full fasts too, and continued in this way for maybe 3 years in a row, thinking all was good, until the end of my last full Christmas fast, where I became quite sick for having fasted beyond my strength and severely weakened my body. All that fasting over the years had caught up with me, and I had nobody, not even my priest, to tell me that I could or even should have done things differently.
Thankfully, at around that time, I was just starting to form a relationship with a monastery and was taught that many people today, especially, who are used to eating well at least 3 times a day, can't just simply start doing full orthodox fasts and expect to get away with it unscathed. All of this came from a monk who, when he was younger, also got seriously sick from prematurely fasting too strictly and who dealt with people like that all the time.
He put me on a much lighter fast for Christmas and Easter and I still stick to it to this day - fasting not being one of my gifts, especially not after the damage it (prematurely fasting too strictly) did to me, the effects of which I still carry around with me today. And, besides, fasting only according to one's personal needs is very much an Orthodox thing, there being saints even who couldn't fast at all.
This, of course, isn't to say that any of this will necessarily apply to you, but I thought I'd share it anyway because it sheds light on a part of Orthodoxy that won't always be clear to new comers.
What's great about Orthodoxy is that, on the one hand, it ultimately maintains the universal high standard of fasting, while on the other, allows for individual needs or abilities, even if that's just until they've slowly developed 'fasting fitness' and can perhaps do the full fasts without negative effects.
Definitely worth discussing with your priest, then, to see what advice he can give in this area.