Due to aches and pain whilst on 20mg Crestor (and my cardio wants me to up to 40mg.) My GP has changed me from 20mg Crestor to 40mg pravastatin saying that this will equal 20mg Crestor. She also recommends that after 2 was I go to 60mg pravastatin then to 80mg. Will this do the same job as 40mg Crestor. I have trouble with the Crestor.