I have osteoarthritis in my neck and spine. In May, I started going to the gym and doing weight exercises in the swimming pool as prescribed by my doctor. The weight was so small a child could probably lift it without problems. Not long after that, I began having headaches, along with neck pain. Then the pain moved to my entire right side. Now, my neck is stiff all the time and the right side burns constantly and also has stabbing pain. Both my shoulder blade and my arm catch when I try to move them. At times I feel like I can't stand it any longer. I've been to my doctor who did x-rays of my spine. The x-rays show nothing broken but the pain is still there and isn't getting any better. What could be causing this?