Two comments:
1) You really answered your own question by listing all the maladies you suffer (I'm sorry). Several of them -- esp fibro -- include lots of pain and stiffness in the mornings. I, too, suffer from RA, fibro, and a few others just for good measure, and I know EXACTLY what you are talking about. You've got to get up and be active, Judy, but take it slow. You get no points at this stage and age for speed.
2) Masterflagger has done a tremendous job of describing fibro. While you read many articles claiming that opioids have been shown to not be that helpful for fibro, I can tell you that without them, I would lose my mind (or what's left of it). So if that is in your arsenal of medications, don't feel guilty about taking it! Just be careful you don't overdo it.
-wpf