I had 3 Pfizer shots but for my 4th shot decided to “mix it up” and got Moderna. I have had aches and pains after each shot that lasted several months but nothing like I experienced after the 4th shot. Within a week I started feeling aches and stiffness - and it got much worse. Especially in my hips, pelvis, and knees. Had problems sleeping and whenever I was stationary for 1/2 hour or more (gardening, driving) it was difficult to move. Told my doctor about symptoms- he ran a ton of blood tests and my C reactive protein came back very high indicating inflammation. He diagnosed PMR (fortunately no GCA). I started at 40 mg, dropped to 30 mg and am now at 20 mg. Rechecking CRP in a couple weeks. Prednisone has eliminated symptoms but I want to get off it ASAP. I am convinced the Moderna shot ( which has 3X the amount of rna as Pfizer shot) triggered my PMR. I am not getting the current Covid shot or my flu shot until I’m off prednisone. I am 64.