Am I hypoglycemic? I get Dizzy and sleepy when I get hungry?

Ok so, First of all, This is what happens to me, Usually when i wake up I'm starving, I eat, i feel good. For a few hours. Then As i start to get hungry again, I start to feel sleepy, Groggy, Sluggish, I feel like my blood pressure drops, like I need a nap. And then When I eat again, I feel amazing? I'm really worried about this because today i was without my car in a situation where i could not eat anything, And i felt like taking a nap, then i ordered a hamburger and fries delievery, with a large coke, and i felt great again. It's so weird, normally people get tired when they are full, i get awake. Does this sound like I have low blood sugar? Or Hyperglycemia? I have had this problem it seems like since i was a kid. I can Hardly function on a empty stomach, even my reflexes get slow. And Now I'm 28 years old, 6ft 3, and 225 LBBS. And I feel like I'm gaining alot of weight in the last year because of this. Can someone please help me. I dont want to be 360 Lbbs this time next year because Of this. :) ALSO, I Had my blood pressure checked In the Spring i had 1 more doctor visit before losing my insurance because i got laid off from work. He said my Blood pressure was good. I Also Recently Quit Drinking alcoholic and Smoking Cigarettes, I use the Patch, But i dont think the problem is because of the nicotine, because i had the issue before i started smoking. And BTW 1 more thing, I checked my Blood pressure when i was feeling dizzy / starving today, and It was 66 beats per minute. Thanks so much.