I have a topical reaction to the 'flu vaccine (and some years grow an egg sized lump at the injection site which is painful for several weeks) yet still welcome having it as influenza can be a killer.
I was advised to wait eight days before having an anti-Covid booster, which I did.
This year, my arm was still swollen from the 'flu inoculation so the vaccinator injected away from the raised area, towards the top of my arm.
I had the AstraZeneca vaccine for doses one and two and Pfizer for the third with very little reaction, just a slightly raised red spot, sore if knocked but otherwise fine. I did not feel remotely unwell after the booster.
Having had Covid, please do not put off having your booster jab, for a slightly sore arm for a few days is rather better than contracting Covid, I can assure you!