Xanax and Tramadol combined - any experiences ? (also considerable weight loss)

Hi - I am a male in my mid 20's
Ive got to taking 2mg of Xanax (generic) a day and 2 x 50 mg of Tramadol about 6 pm every evening. I sleep well (even though I get up a little earlier than usual).
I've also noticed Ive lost a bit of weight - I like to go to the gym but find it difficult to build muscle so ideally don't want to lose too much weight.
Any advice here would be welcome. When I first started the Xanax I had headaches but these seemed to have cleared now. I also drink some grapefruit juice with the Xanax. Do any of you guys think I would have any issues in combining the 2 (they seem to work very well).
Also - any tips in not loosing too much muscle (not that I started out with too much would also be really appreciated). My diet is relatively healthy with vitamin supplements (but I do have a sweet tooth)!

thanks
Mark