Side effect?

[u/Bitter_Young_Hag]

I had my first shot last Friday. I live with IBS and acid reflux, but I didn't have any nausea, constipation, or diarrhea there next week.

However, for the next few days, my abdominal muscles were tired and weak as if I'd had a 12-hour puke fest. It took effort to speak and my voice was shaky because my abdomen wasn't engaging enough to push out naturally. It went back to normal in a few days.

I took my second shot last night. I woke up with the same issue this morning, which makes me think it's a side effect of the shot.

Dr. Google didn't mention anything about this. Has anyone heard of this this?