What Causes Severe Sore Throat Along With Body Aches And Chills?

Hi! I have had head cold since Friday started with severe sore throat, body aches and chills, no fever. Now have some of that but also chest congestion and slight cough. Had left ear ache at start also. Now today, day 6 I started vomiting badly with tummyy cramps and diarrhea. Nothing staying down since 4 pm, it s 9, nauseated. Before vomiting I was taking amoxicillin and OTC cough med and sinus med. What should I do and what is iy