What Causes Dizziness And Palpitations After Switching From Crestor To Atorvastatin?

I have been on crestor 20 mg once a day. the insurance company swithched by to atorvastatin 80 mg once a day. I think this is an error. I have been on the new dose for 4 weeks and have lost 12 pounts, having dizzyness and am lightheaded. also having joint pain and radid heart beats? My name is Ron Jones and my email is YYYY@YYYY