I am 64 and was diagnosed with PMR after my 4th shot which was Moderna (previous 3 shots were Pfizer). I later learned that Moderna 3 times the mRNA as Pfizer (100 micrograms vs. 30 micrograms). That may provide more protection but it may have been too much for me and resulted in my PMR.
My doctor agrees, no further Covid vaccines until we get PMR under control. You can report adverse vaccine effects to the government at https://vaers.hhs.gov/. I did. I feel like the data is important.