What is wrong with me?

Well for starters I plan on going to the doctors on Monday so there's that and I'm 17. But on Wednesday around 12am out of no where I had a strange panic attack. I got light headed had a rapid heart beat and felt as if something was wrong. I thought it was a heart attack so just in case I took a bayer asprin. But I seemed to calm down a little after that and kept having a rapid heart beat but I wasn't as light headed so I layed down and all through the night I had random panic attacks with the light headedness. I ped out around 6am then woke up at 7am stayed up for a bit then ate some of a potato and a little meat... well after that I got light headed but no panicing... so I decided not to eat anymore... then I went to sleep at 11am and woke up around 2pm and woke up feeling better.. and I tried to eat again and it was the same thing I tried to eat in the morning and no lightheadedness... then around 6pm I tried to eat again and tried just a little bit of rasin bran and then I got light headed... so I just decided not to eat. Then around 12am yet again another random panic attack with the light headedness... this time I just felt the need to pace and not sit down... but I was extremly tried from not sleeping very much so I decided to just ignore it and try to sleep which I did. And I woke up feeling better but yet again I ate I had a subway cold cut sandwich and only ate 6inches not a foot long and the light headedness came back... I know its not a heart attack because I haven't had any sweating, chest pain, nausea, arm/jaw/neck/back pain. I'm wondering if its low or high blood pressure... or postprandial hypotension, and please no stupid remarks -.- this is serious.