I tried to go back to work prematurely, as I often do. My boss told me to go home and only work half a day, because I looked too sick. The girls all said I "looked thin" and they wanted my illness. I said "Uh, no you don't, it's not worth it!"
Mind you, I'm off 4 days now on my marathon training. So I thought, I'll go home, sleep a few hours, and take kickboxing. I feel fine now. I'm just tired. I can do it!
I am raring to go in class. I get about halfway thru, and then, the instructor got blurry. I could hear her but she sounded distant. She seemed to be in a tunnel...My mind raced... "omg I'm going to pass out, stay present" I tell myself.
I actually pinched myself to not pass out. I kept breathing away nausea...half-assing my kicks, until finally, I had to rush out of the studio to the bathroom, and... blow chunks.
My chunks didn't even hit the toilet, they were all OVER the toilet. Cleaning them up was super awesome.
Lesson? Listening to your body is really important.
If your body is tired, let it rest. It's way better to take it easy than to yack all over your gym bathroom.