Weak, tired, Hypoglycemic...help?

I'm April and I'm 18 years old.
I just got back to SC. from a 3 month trip to Michigan. I've been home for about 5 days now.

Ever since the day I left I've been feeling Hungrier, Dizzy, tired and weak to the Point where I can't hardly stand up! And it's been feeling like i'm getting more Hypoglycemic, Like in need of more sugar because I get so weak during the day.

I try and try to get more than 4 hours of sleep at night but nothing seems to help/work.
I went to bed at 3am last night and I probably got 2 1/2 hours of sleep or less.
I just couldn't get myself to fall asleep at all.

I don't feel sick, I don't have a cold or the Flu either. And I'm not Nauseous at all.
I had to drink 2 energy drinks the last 2 days to help me stay awake and to keep my blood sugar up.

I have a History of Mild Asthma and Anxiety. I don't think that has anything to do with what I have now?

Does anybody have any idea what this might be?
Any tips, advice would be wonderful!

Thank you -April