Yep, that's where I had mine..... I found that statin caused me serious problems in the big arm muscles, I could barely move my upper arms at one point.
Go back to the doc and ask for a different statin, I've been on several until I found one which suited me.
I had to have physio to start to get the full movement back in my upper arms, that was about four years ago. It took a good year to get back to normal, so please don't live with it, do something about it.