I took lipitor for 4 months. I exercised a lot and improved my diet. However, I gained almost 10 lbs in that short time. It did greatly lower my HDL/LDL, but I quit taking it because of the abdominal weight gain. Since I've quit taking it, my head has been itching like crazy, but I'm a lot less bloated and feel better.
As for muscle pain, I didn't have any, but the doctors and nurses strictly said to stop taking it if muscle pain occurred.