IMPORTANT Medical Help!?

So 2 days ago I was doing the dishes and I started to feel really light headed, my eyes rolled back slightly and I felt like i was gonna fall backwards. I grabbed onto the counter top and tried holding myself up. I started to shake and my legs were really wobbly like they were giving out. I had to really hold on to the counter to prevent from falling. The shaking lasted only about 20 30 seconds, then slowed and stopped. For the rest of the day I was okay other then feeling a little tinny bit dizzy and a horrible headache. I went to the doctor but they didnt bother running tests and just sent me away. This is the third time its happened in the past I think 9 months. Please if you have any ideas as to what it is please let me know. The doctors said that i guess what I had was an attack that was between a seizure and fainting but other then that he was no help!