Lipitor and body jerks

Hi, I am a 45 year old male with high cholesterol. prescribed 20mg. of Lipitor to control it. Am having a strange twitching muscle in my right calf since I started the meds. Forearms hurt, trouble sleeping, twitching in my sleep, apparently, tiredness. I'm worried about going off it. My dad died of a heart attack. Would it hurt to try going off it for about 3 months?

At night when I go to bed parts of my body jerks. Sometimes both shoulders, sometimes a foot or a muscle and other parts of the body. Also, my fingers lock. Plus, my hands aren't steady and my legs feel weak. I'm 72 and have been on Lipitor for about five years. I don;t if I should stop taking it and what I should try. I take 500 mg of Vit. C and omega 3.