Meat content symptoms and conditions

I have been on 10mg daily dose of Lipitor for over 2 years now. When I was first prescribed the drug my doctor stated that because my cholesterol was so high I would not be able to control the levels through diet alone and would therefore need to take Lipitor indefinately.
Initially my blood cholesterol dropped dramatically & I & the doctor were pleased with the result.
I continued eating a similar diet to before which was balanced, with no excess fats or salt although I was eating red meat on a routine basis.
About six months ago I started experiencing severe muscular pain in my neck & shoulders. My neck muscles became so inflamed & immobile that I had days when work was impossible (I am a chauffeur/butler). These pains did not respond to antiinflamatory or pain killers. I made two visits to an oestiopath & received manipulation & massage. The relief was temporary but not complete.
Just one month ago I cut out red meat, most animal fats & changed my diet, replacing the red meat content with grilled fish or chicken. I eat lots of fruit, vegetables & salads.I also take a multivitamin dose. At the same time as my diet change I increased my excercise regime.
WITHIN ONE WEEK of the new regime I experienced severe muscle cramps & my joints 'dried' to the point where they clicked & cracked whenever I moved them. I suspected the LIPITOR so I stopped immediately.
In just a few days the joints stopped clicking & grinding & my six month old muscle pains disappeared. This I think is not a coincidence.
I am male, 43 years old & very active with no other medical conditions of any kind.