Heart atacks symptoms and conditions

Was on Lipitor 2 years ago and had to come off because of side effects - sever muscle pain.. Prescribed Niaspan instead .. 2 months ago my cholesterol rose to 7.1 and my doc put me straight back on Lipitor - 10mg.. Feeling lousy - neck pain, leg pain, dizziness, fatigue ... head feels fuzzy all the time and get sudden twinges in my chest.. Had stress test done last week and all ok.. Also have severe digestive problems. Going to wait until 2 full months done and going to get bloods done again