HA Recovery burnout

I (22f) have been struggling with HA for the entirety of my adolescence (high school and college). I used to follow a vegan diet since the age of 14, and have been an adamant gym rat since I’ve been legally allowed to have a gym membership (13yo). I now incorporate animal products into my diet every day. Health is something I value highly, and of course not having a consistent period has been giving me lots of worry. I would periodically get spotting once every year or two but don’t remember having a full period since I was 19. I’ve gone to a couple doctors and each one suggests going on birth control which I absolutely don’t want to do (I took it at the age of 15 and it made me gain lots of weight and messed with my mood so much). It’s been getting so frustrating since I try and do everything in my power to get it back. I live an active lifestyle but I have been tracking my calories over the last 7 months to ensure I always get 1500-1700 every day. I’m 5’5 and 125lbs so my bmi is within a healthy range. I don’t really know what’s left to do. Any advice would be super appreciated!!