Coincidence or not. Had my booster jab a week ago no problems. But over weekend and today getting like a fluttering / pulsating side of left breast near underarm, no pain whatsoever just a strange throb now and again. Standing up, or laying on back, nothing at, all only sitting. Any ideas?
I suggested muscle twitching because I get it, Chris. Palpitations are felt more in the heart area surely, not on the side near the armpit and not only when sitting? But feel free to correct me.