I have been on lipitor 40 for about 6 weeks. I am 50 and pretty ...

I have been on lipitor 40 for about 6 weeks. I am 50 and pretty fit - doc prescribed it because my cholesterol was 6.7 and I have family history of heart disease. The last 2 weeks I feel like I'm getting the flu. Joint pain and very tired. Have trouble motivating myself to exercise. Although I have had psoriasis for some time, it also seems to have become worse since taking the lipitor. I would rather try to reduce the cholestorol level naturally but doc said its in my genes. How do I work out if I am generally run down and stressed (which could be the case) or if I have genuine lipitor side effects? What will happen next?? It's pretty scary reading some of the posts on this page...