Keep in mind that boosters are now considered only good for 6 months, so depending on your definition of “the next few years”, you may be exposed to many times more spike protein load via the vaccine route.

Anyways, I have no horse in this race, but I did notice some unusual chest tightness after my 3rd shot very recently - nothing serious though. I’m completely stress-free in life, so it’s not anxiety. Things have been great for me.