Training regimen symptoms and conditions

I have been on Zocor for one year. I am a former athlete used to dealing with pain associated with playing and training at a high level. Since using Zocor, my energy level has decreased significantly, very tired, before, during and after workouts. Muscle pain specifically in my neck, back and legs has significantly increased without cause. I have a constant feeling of a stabbing pain in my abdomen, accompanied with nausea, bloating and abdominal gas. After seeing some of the posts on this site, has there been a lot of reporting of abdominal pain? Bloating? Gas?
I too, have had trouble sleeping, accompanied by unexplained itching, and now after seeing these posts probably some mild depression. I believe I've had some short term memory loss - but then I can't really remember - LOL. Is the drug worth it? Physicians all seem to downplay the side effects, justifying the desired lower cholesterol, as more important than the side effects.........is it?
At 46 years old and formerly a competitive athlete at an elite level, I'm wondering if feeling better by NOT taking the drug is better than feeling worse and taking it. My training regimen was very intense prior to starting Zocor - NOW - it seems as if I can't keep up any longer. Any response to these problems would be greatly appreciated.