Dizziness?

I'm 18, and these things have happened every once in a while but I had one really bad night where i was so lightheaded, I thought maybe it was from not eating for a few hours so I ate and it made it worse. Then later I couldn't eat at all because my mouth was so dry, I couldn't move or get up because of the dizziness, I was also shaking uncontrollably. After that night I became dizzy at least once a day every day after. I almost passed out at work a few times and had to leave so this is seriously messing up my personal life. I get lightheaded from not eating every 2 hours (which is annoying) and I get lightheaded from working out and I am in pretty good shape. Also, sometimes i feel a weird sinus pressure before I get lightheaded, or a sharp pain like in my head. I went to the doctor to see if I was hypoglycemic or something but the blood tests came back normal. SOMEONE HELP PLEASEEEEE?

[Samanthab259]

Maybe you should ask your doctor about getting a mri.