Hi @sancho, vaccinations are hit and miss as far as side effects go in people. Some folks are lucky and have nothing, others can feel pretty miserable with aches, flu-like symptoms, fever, headache, upset stomach, etc.. In the last year I’ve received more than 30 vaccinations, as well as flu and covid shots after my bone marrow transplant. Most of the time it was just very sore arms. This year’s flu shot had me needing Tylenol to reduce fever and chills. I woke up in the middle of the night drenched in sweat.

I’m wondering if you had a fever and it broke? That can cause some perspiring. Did you take your temperature when you were feeling so awful?