I fainted a few days ago from getting up too fast and I haven't felt right ever since. I've tried to stay hydrated and eat the right foods but it doesn't seem to help. There is pressure on both sides of my head, I constantly feel dizzy, and I have no appetite. The dizziness and pain also makes it difficult to sleep which worsens the problem. Not sure what is going on with my head, I'm too scared to even drive a car. Please help.