Suggest Treatment For Sinus, Burning Stomach, Nausea, Weakness And Mild Fever

hi, I have had some kind of stomach flu thing that I picked up at my parents house. I might add a month later and my father has had several relapses and so have I. I have never had anything like this. Sinus drainage is very bad. Burning stomach... nausea, weakness and a low fever. Occasional vomiting in the early morning, but haven t done that in a week. You begin to get better and then, BOOM another relapse. I m going on week 4