Off Prednisone but still feeling new type of pain

I've been off Prednisone for 6 months. (I was on Prednisone for 3.5 years). My blood inflammation markers have been normal for years and multiple Rheumatologists and doctors all said I no longer had PMR. So I went off steroids.

So now the question: Has anyone else gone off Prednisone but still plagued with mysterious aches and pains (muscles and joints - but not as severe or similar to PMR)? It's something else, I think.

I can get along okay during the day, but first thing in the morning I'm very stiff and it hurts to move. Also if I sit too long, then the same thing happens. Once I get moving it gets better quickly. Although throughout the day knees, hips and upper arms can occasionally hurt. I can't do things like I used to.
I've seen so many doctors who can't tell me what's wrong.

anyone else?

I don't want to go back on Prednisone and I don't want to resort to other drugs, but quality of life is definitely suffering. So wondering if maybe I should be taking some sort of medication (not Prednisone).
any suggestions?