Thatmustanggal, there are so many variables to weight gain/loss.
You sound like you're working out a lot? Are you eating enough calories and drinking enough water? Weight fluctuations are very common after getting clean.
Maybe try something like myfitnesspal to track your calories. Did your doctor test your thyroid levels?
I've lost weight since going off subs. I practically had no muscle after years of drug use, so I too have been working out. Slowly. I make sure I eat enough to sustain my energy. Weight gain can be a trigger for me so I understand how you feel
Congratulations on quitting! Please don't let this derail your sobriety!