I know it'll be hard, but try going a week or so without having anything in your diet that contains gluten. Nothing with wheat, rye, oat, barley, etc. in it whatsoever. Corn & Rice is OK, nothing else grain-wise. Make sure to look really carefully at ingredients, too. Even something as innocuous as "Modified Food Starch" can contain gluten. That means no beer, too. (nor whiskey, etc. nothing that started out as a grain, period, including stuff like Mike's Hard Lemonaide)
I say that cause I have a friend with a genetic disorder called Celiac, which means he cannot tolerate anything with gluten in it, and if he did have anything, he'd get symptoms kinda like what you mention.
Basically, it's not exactly a food allergy, it's something else. Basically, when you eat food, your stomach's job is just to break it down. All the nutrients are actually absorbed in your small intestine, for the most part. What happens with someone with Celiac if they have gluten is that there's a rather strong reaction that damages the lining of the intestine, making it so you have a real problem absorbing the nutrients, and making you feel like crap. Now, the lining can repair itself, given time, but if it keeps getting damaged, it can't. Not to mention, the more it has to try, the greater the odds that something in the rebuilding phase will go haywire, and you end up with intestinal cancer, which would, obviously, be a Very Bad Thing.
More information can be found here:
http://www.medicinenet.com/celiac_disease/article.htm
Anyway, I am in no way a doctor or medical professional, but it would hardly hurt you to cut gluten out of your diet for a little while to see (though it will be annoying looking at all the food labels), and if it makes you feel better, then it's worth it, right?
Definitely definitely go see a real doctor though, once your insurance kicks in.
-Arlos