Welchol and stomach pain

When I take Welchol, my whole body is wrenching in pain from the muscle spasm, stomach pain, and I can't sleep from the pain. My body feels as if someone has taken it and just twisted it from my legs up. My doctor prescribed me to take 2 tablets 3 x per day. If I take one during the day, I can usually make it without too much pain. But if I take just 1 tablet in the evening, I am miserable and cannot sleep. I have lipitor and am trying to just take it, but the doctor says I need to take the welchol. My cholesterol is very high and my good cholesterol is extremely low. I know that this drug is supposed to help with raising your good cholesterol, but the side effects are devestating. Even now when I do not take welchol, I have really bad pain in my lower back and hips.