My daughter is 24 and one evening she got nauseous, dizzy, and then fainted. She came to a few seconds later and was having convulsions so much so that she could feel her eyes going backward. Convulsions then subsided and she could not move for a little while and was totally drained thereafter. What could this be. We were at a doctor who did a neurology test, blood pressure test etc and referred her to a neurologist, but he did not test her heart or test for diabetes. We want to rule out these two before going to a neurologist which costs a fortune. Please help us in the right direction. Should we rather get more tests ie diabetes etc?