Night itching all over my body

I ate something that made me feel nausea and had a running stomach a few hours i ate the food, and i stooled all through d night, later around 4am, i vomitted, and felt a bit relieved, then i took tetracycline and flagyl in the morning then later in the day, i went to the chemist, and they gave me a drug to to stop me from vomitting or feeling nausea, which worked, i dnt know the name of the drug, but i was told to swallow it without water. Then the next day, in the night, i started itching all over, then it stopped in the day time, then started today again, but mostly under my feet, i dont know what's happening with me