My first pains occured within a week after my second Pfizer vaccination (March 2021) and took 4 months to diagnose because it only hurt when in bed and got worse around 4:00 to 6:00 AM. I had no inflammatory markers at all. My pain initially was in my muscles of my thighs and upper arms. No real joint pain that I can recall. I managed to taper off of the Prednisone after about 1 1/2 years (started with 10 mg), but after I contracted COVID in Dec. 2022, it came back, so I'm currently on 2 mg. It is now confined to my upper arm muscles (?deltoides). BTW, I am a registered dietitian and eat a whole foods organic diet, high in anti-inflammatory foods. There is a government agency to report this to, which I did. Here is the link: https://vaers.hhs.gov/