NB I am a type 2, but 70 years old and with a failed thyroid.
I suspect that the really nasty illness we had at the end of '19 was Covid - I live in Poole, Dorset and it is a ferry port. Our little area is the most obvious point to stop to fill up with petrol and do a bit of shopping, so I hear a lot of foreign languages in the local shops and can direct people to the free car park in several of them. If something is coming this way, it lands here first.
When I had the first AZ jab I was really rather ill, first with sore throat, cough, low fever and then with swollen feet and legs.
The second one I approached with apprehension - nothing - not even a sore spot where it went in.
When contacted about the booster, I was down with the Om version, definite symptoms, but I've had colds which were worse.
I suspect that many will have found that the jabs caused totally different reactions - quite a few I have spoken to have seen the same, reaction to one and not the other with no pattern to it at all.