Dealing with Fibromyalgia and Degenerative Disk Disease

Hi, I'm new here and this is my first post. I was diagnosed with Fibromyalgia in my early 40's. I mainly had problems with pain and fatigue when I "over did it". I'm now 67 and it seems that after I hit 60, the fibro just went crazy and I now deal with pain and fatigue every day. Not to mention the Degenerative Disk Disease kicking in, as well. I work part-time at a dollar store cashiering mainly but have some stocking to do, too. By the time I get home, I can barely get out of the car and within 30 to 45 minutes I have to just lay down and let my body recoup. I'm fine as long as I keep moving, but once I stop, oh boy. I just start freezing up. Does anyone else deal with symptoms like this? What do you do to help relieve stiffness and body pain? Thanks.