''I have heard' isn't exactly the best form of advice
whilst Aspirin might seem like a good idea for stroke prevention - and, I indeed began it in the very early days of Covid - just in case --
we now have studies which show no evidence that Aspirin can prevent any clots etc post vaccines in question
if one has a family history etc of heart disease and similar - different kettle of fish.
What we do know with Covid - it's easily researched - is that it can go from 'I'm doing ok, to total shit, very rapidly - and if it does and particularly if someone lives alone - then, they would best get to doctor or hospital - because if per chance it does turn to shit -
one might not be able to do much at all if it just keeps on the slide
and also - don't trust if one is thinking one is 'getting better' -------- it can turn on you then too