This article, posted by John, Volunteer Mentor above, seems to confirm connections. You can read it and form your own conclusions. You will need to scroll up to his post to use the actual link.

My symptoms came on a couple of days after my mid-October 2021 flu shot and by mid-November the PMR diagnosis was clear. in fairness, my ESR was elevated the day I got my shot, but I had no painful symptoms of any kind, and now the painful symptoms are through the roof. I am going to ask my doctor if the flu shot I received was an "adjuvant' or non-adjuvant shot. If it was, I see a strong possibility the shot triggered my system with PMR. A brief explanation of an adjuvant vaccine is as follows ,and the article explains why this even matters:

"An adjuvant is an ingredient of a vaccine that helps promote a better immune response. Adjuvants also can reduce the amount of virus needed for production of a vaccine, which can allow for greater supplies of vaccine to be manufactured."

I hope you are able to conclude whether the vaccine played a part in subjecting you to both disorders.