, I'm sorry to hear that you had troublesome side effects after the first dose of the Pfizer vaccine. For your safety, we are unable to provide medical advice. We can't suggest what you should do. I would however suggest that you call your own doctor(s) to ask about this.
There are so many variables regarding who experiences more or fewer side effects. Age and gender can be a factors, as can whether someone has already had covid19. Whether someone is immunosuppressed can affect the degree of side effects.
You are already 6.5 weeks post your first shot. I am aware that in some countries the 2nd shot is not being administered at 21 days which is the general recommendation.
If I were you and very concerned, I would call my doctors - primary care and/or rheumatologist - to ask for advice. They are the ones who know your health history the best and who can make informed suggestions.
Please know that we are here for you. If/when you do get the 2nd shot, let us know how you are doing. The community is here to support you.
Best, Lisa