I Am A 74 Year Old Female Who Takes 10mg

I am a 74 year old female who takes 10mg of Crestor and six tablets of 625 mg Welchol each day. My legs have become so weak I can hardly stand up after sitting for about 10 minutes, and I have difficulty getting up from the floor. My doctor has changed and reduced my statins several times. Could so much Welchol be affecting my muscles? I do have muscle cramps daily.
pete