Bladder scan symptoms and conditions

I am 53 years old and have been on 10 mg of Lipitor for at least 5 years. For the past 3 years I have been experiencing tight muscles in my back and muscle spasms on my right side. I have had the following tests done - all of which came back negative: CT scan, Ultrasound, MRI, gall bladder scan, kidney scan, pelvic exam, even had a colonoscopy (that sucked), and went for physical therapy which the therapist said I had weakness on my right side. The doctor never even suggested to stop taking Lipitor but after reading these posts, I'm stopping myself.