How can you say that you are loosing muscles? Are you basing it on weight alone? If yes, then its not a basis. People still loose muscles even if they are on anabolics, drugs don't do all the work ya know. Plus, since you're taking an ancillary (arimidex) it would combat the estrogen conversion in your body and would also aid in removing water retention... So, don't freak out. Weight isn't the basis of everything. I know these things from experience and knowledge.