There will always be some side effects for some people.
We had the flu and COVID jabs 2 days before we went on holiday about 2 weeks ago. Four days in DH started to go down with a respiratory infection, which I do not think had anything to do with the jabs. There was quite a chorus of coughs on the tour coach. Two days later I went down with the same infection, but we have both been very unwell with the infection.
On Monday morning,having got home late on Sunday, I had to ring the surgery because DH was so unwell and we actually got a house visit because the doctor agreed DH was too ill to get to the surgery. He was threatened with a hospital admission, but medication managed to avoid this.
As I said, I do nto think there was any link between vaccinations and illness, but I suspect that the very short period bewteen the jabs and developing the infection affected the severity of it.