Metformin Hydrochloride and muscle pain

I just started taking Metformin for PCOS and suddenly I began having severe muscle pain on my left side, upper thigh area. So severe that I can hardly walk, sit on a chair or get up once I do. I have had no problem with mobility previous to this. I had severe, runny, almost water-like bowel movements so I decreased and then gradually increased the dosage over time which helped resolve this (sorry to be so graphic). I describe the pain like a pulled groin muscle, although I've never experienced that, but that is the area that the pain is in. Has anyone else experienced this type of muscle pain??? If so, what helped if anything?

I've been on Metformin for about the past three years. I'm now 65 and a half, and I've recently decided that this drug has caused me a lot of muscle pain, making it hard to take walks (which I force myself to do) and to sleep. I used to put this problem on my age, but since my doctor has been cutting my prescripts back, I am improving. In fact, if I miss a day or two of the meds I am much better. I've never been on Zocor or any Statins (my side effects sound a lot like those mentioned in the Zocor Forum), and refuse to go on them, and am now wondering if I should refuse to be on this stuff any longer, as well.