Should I be worried ?

I'm 17, 5'7 138lbs and I keep throwing up what ever I eat or drink... ...Even water and ginger ale I cannot keep down. I haven't eating or drank anything for the past maybe 6 hours and am feeling very weak and dehydrated. I'm getting dry heaves so I know that nothing is in there. But I've stopped sweating and I know that is a bad sign... I think it might be food poisoning, what do you think?