My fiance had an accident the other day in the shower. He bent down and came back up again but stood up fast (and the water was really hot) but when he stood up he got light headed and dizzy and fell to his butt. I was in there with him and I knelt down in front of him and he was twitching & his tongue was moving in and out a little bit. I thought he had a seizure. Doctors took blood test to check for diabetes and blood pressure, but it came back okay. Then I thought maybe it was just fainting with muscle spasms. He's never had this happen before. And he was lacking food in his system because he had not eaten much a couple days before. I just want to know if this could be something really serious.