Anecdotal, yes: I've never had allergies before (at least not ones I acknowledged) and now that I'm fully vaccinated, I've got crazy responses. Interesting nonetheless.

Are you saying you not only had an allergic response afterwards, but that your new allergies persist to this day? If so, very interesting. I wonder if a severely-heightened immune response could cause your body to sensitize to otherwise harmless agents if the conditions are right?