Simvastatin and ribs

I started on 40mg of simvistatin 3 and a half months ago,after being on them for a week i started to get bad headaches and felt really fatigued,so when i told my gp she said its just a matter of your body getting used to them,so i continued taking the pills i seemed ok for a while but 5 weeks ago i started with palpitations,then i got indigestion, and general discomfort in my chest,weakness in my arms and legs, headaches and the fatigue came back worse than ever,i haven't been back to see the doctor,i stopped the pills yesterday,the indigestion has gone already,i want to lose about a stone and try to lower my cholesterol myself ,but how can you exercise when you feel so weak and tired,my cholesterol level is 5 but because i suffer high blood pressure the doc said it needs to be 4.3,does anyone else suffer from the same and is on this medication?