Less than a week after my second Pfizer COVID shot, I developed a serious peanut allergy that sent me to the hospital. I have eaten peanuts and peanut containing products my whole life without any problem, but within a week of that last shot suddenly I became very allergic to peanuts and some other nuts. Coincidence maybe, but it seems strange that after some 70 years of eating peanuts without incident, now I carry an epi pen if I should inadvertently eat a peanut.
Imagine that you had a Level 1 allergic reaction to peanuts all along, too low to ever actually notice the effect.
However, the spike proteins generated by the injection had the result of amplifying that allergic reaction, making it a Level 100 allergic reaction, very noticeable and very problematic.