I also have Fibromyalgia. Pain is a way of life. If I spend to much time on the computer my shoulder gets to hurting & then the pain spreads. I was also have issues while sewing. I found I was hunching my shoulders up too much to quilt on my machine, so I bought a different chair. I had a cheaper basic computer chair, but it couldn't be raised very high. Now I use a drafting chair, which is much higher. No more shoulder problems.