You're healthy.
Headaches are one of the side effects but I would take that any day rather than catching covid.
Sometimes I get headache after red wine ?
Yes, and keep in mind this is family with four adults (two young adults), a total of 14 vaccine doses administered (one did not get sputnik, three got sputnik + pfizer), and one got Tetanus booster shortly after the second Pfizer (long story but not overly serious emergency visit in Canada led to check of last Tetanus shot - too long ago - and much discussion amongst doctors). (Who decided that covid and tetanus - together or separate - are both FAR worse than the minimal chance of some reaction to any of these vaccines and that even tetanus a week after pfizer is super low risk)
Anyway: in that pretty large sample (well, compared to most families) there have been zero reactions that were more worrisome than a caffeine headache or feeling slightly out of sorts for a few hours. And that was perhaps two cases of the 14 shots (15 incl tetanus). We honestly can't say that these were reactions to the vaccine shots, and far, far less than what doctors described to us as 'common side effects'. (Side note: I don't know what they mean by 'common' in the sense of percent of those getting vaccine who experience them - I think they mean not rare)
I've had lots of other vaccines including some more exotic ones due to travel that are known for common reactions - I had sort-of headache/out of sorts for a few hours with covid and that was nothing - I had a nap. I might have just been tired - at any rate I'd classify what I experienced as trivial.
Anyway, just our experience. But FWIW I don't know anyone who's had side effects worse than ours, ie. almost everyone has said no side effects (or completely trivial.)