Symptoms of pericarditis

Several days after the elderly couple I share a household with got the first vaccine I came down with what was consistent with symptoms of pericarditis. Am aged in my 40’s. Put me out of action for a couple of days (relief was lying down) although the symptoms persisted for about 4-5 days total. Did not suffer similar after they got the second vax.

Is This NZ Based or Overseas? : NZ