Chronic headaches, nothing helps?

I've had headaches nearly every day for about 4 or 5 years. There's around my eyes and the front/top of my head. Sometimes it almost makes me cry. It started in 5th grade. I've gotten a CT scan and an MRI, and there was nothing there. So there's no tumors or anything in my brain or something. I've gone to a neurologist and tried 3 different medications (propranolol, depakote, and topamax or something like that, not exactly sure what it was called). I've gone to an eye doctor, and I wore reading glasses, but only for about a year, in fifth grade. I went again recently and he said my eyes were fine, like, I might need reading glasses, but it really wasn't that big of a deal. I went to a chiropractor and that didn't do anything but make me irritated, although it did feel good. But she suggested that I might be allergic to something, so I took an allergy test and it said I was allergic to eight very common foods. I went for a month or two without eating these foods, and it sucked, it stressed me out and my head didn't feel any better. I did stop not eating those foods then. But I don't eat foods with MSG or aspartame, and I try not to eat deli meat cause they have something in them too, I can't remember what it is though. I tried acupuncture. I really liked it, but it didn't help. I tried doing yoga, as suggested by my doctor, but that didn't help either. She thought the headaches were caused by stress. I eat healthy and exercise and drink lots of water. Lately it's gotten worse, probably due to allergies. But nothing's helped that either. I have this pressure in my sinuses and stuff. I take Zyrtec. I've been using a neti pot and Afrin nose spray. I can breathe easliy, but the pressure is still there and it really hurts. I did have a sinus infection a few weeks ago, and took Mucinex DM and amoxicilin and Flonase (but I stopped using that). And I've also taken Sudafed nasal congestion stuff. Even without the sinus problems and allergies, I feel kinda dizzy a lot.