Hello I Have Been Dizzy For A Week Now And

hello i have been dizzy for a week now and it gets better for a little while then it hits me harder then it did the first time have been to the doctor they said they ran all these test and i am fine i know it is not in my head i have been throwing up and nausus for a week as well when i sit up lay down eat and i have chest pains as well not depressed or stressed can you help me