Just following up on my strong reaction to the first dose.
This Israeli study
One dose of COVID-19 vaccine provokes strong immune response in those previously infected shows a link between having had the virus and then having a strong reaction to the first vaccine shot.
I recall my last flight before lockdown from SYD to BNE I sat next to an older couple who came from the Ruby Princess and were flying home. There was one Brisbane couple where the wife died from COVID and I had a vague feeling that I had seen them before when the news was released and the husband was interviewed.
I came down with the flu following that trip, but at the time I thought I caught something in NZ as the people I was working with in Auckland had various sniffles, before flying to SYD. I was alone at home for 10 days with the flu symptoms lasting about 5 days. This was before any testing.
Pure speculation on my part that came from reading the synopsis of the Israeli study.