Anecdotally, in my home, my wife had chills and general ickyness from about 12-36 hours post 2nd dose. Myself and my teenager had no side effects at all. Even the soreness at the injection site was less after shot #2 than it was for the first.

Don't let fear of side effects drive you away from getting the necessary booster. As of today, Fauci says I can ditch the mask. I'll still be keeping one in my pocket just in case though.