I was taken off Simvastatin at the end of january, because it caused sudden stange highs, lows and inconsistencies in my BG levels. Apparently this is a side effect of Simvastatin that is not widely spoken of. Since stopping, my BGs have been much, much better. I have a blood test at the end of the month and another visit to the consultant to see what has happened to my cholesterol levels in the last 3 months.
I was on Pravastatin for years before that, with no problems, but my GP changed it to Simvastatin because she said that the efficacy of Simvastatin in Diabetics has been studied much more, and its effects are well understood! Except for strange side-effects, I think.