Whats wrong with me? Any ideas?

I recently came back from vacation, and 2 days later, i began vommiting. its now been almost a week since i first started feeling sick, and i dont know what else to do. i thought it was a stomach thing, but my stomach feels okay to me, i feel cold, and discomfort at the top of mystomach like in my chest, right below the . i tried ginger ale, cracker, antiacid meds, and nothing works, everytime i eat, i feel like it just stays in my chest, and i always end up vommiting. even when i dont eat, i still feel like vommiting, i dont have insurance, cant afford another hospital visit, any suggestions?