lightheadness

Please help!
I went to bed one night an the next morning I woke up and was so dizzy/lightheaded I could barely walk..it came literally overnight..I finally went to the doc later that evening..checked my ears an she said she could see fluid in it an said I had vertigo..she put me on an antibiotic an that had no help at all..my blood pressure was 147/86..but I was figuring it was juat high due to stress..one day while I was at work I walked into the gas station we were doin work to an a couple mins after I walked in, my vision was black an cloudy..seemed like someone just turned off my switch...like I was going to black out..it scarred the hell out of me..heart was beatin out of my chest..theres not been a day in 8 months that I have actually felt "normal".. im a 23 year old male, 5'9 an 120 lbs..in pretty good shape..this thing has me freakin out, my heart beats weird sometimes, an out of no where when I think im doin okay ill get a very strong lightheaded feeling an almost pass out..ive been keepin a record of my BP an my sugar levels..my bp raises a little when I feel like this but my sugar is fine..my family has a history of heart disease an that freaks me out! Im 23, I want me life back!! If anyone could help, id greatly appreciate it! Oh an when im nervous or anything like that, I get lightheaded..but driving somehow makes me feel kinda better..dont know why or how but thats the only thing that seems to help out..please help!