A self-inflicted concussion
I managed to give myself a #!% concussion, or something like a concussion, on Saturday. I've been icing down my head for the last two days, and then as I drove to work today, I had a a warm, fluid-like sensation under my scalp, and finally thought, "Geez, Al, what are you doing, get to the doctor, work will wait."
I had an adventurous drive, but made it to the ER, and they said I did the right thing. Had I gone to my regular doctor or an immediate care center they would have either directed me to the ER, or put me in an ambulance to the ER. They also said I may have ongoing symptoms for days, weeks, or even months.