I Feel Icky...Any Explanations?

Today I woke up feeling really bad, like, as if I was gonna barf at any second. And it just got worse throughout the day, and I really feel like screaming with frustration because I tried Advil, Tylenol, and all that stuff, but I just feel WORSE. My head's throbbing, I am this close--> < <-- to barfing, and I'm already grounded for being grumpy and irritable....Any help here?