The few people I know who had the second injection (both Pfizer and Moderna) reported feeling unwell with flu like symptoms for a few days. That's not really the reaction I'm concerned about. It's the idea that my immune system seemed to go an overdrive response with Remicade and again with Humira. The symptoms were wide spread, debilitating, and continued long after the drug was cleared from my system. I still have nerve damage over 2 years later. My worry is that my immune system will go over board. It doesn't seem to like to take a 'wait and see' approach when faced with what it might think is a threat.
I realize I likely won't find any information to ease my specific fears. I'll just have to get vaccinated and do that waiting and seeing!