My symptoms started on saturday with a sore throat and fatigue, i started increasing vitamin c and self medicated. now i have body chills and i am feeling cold; with fever that is moderate yet comes and goes. yesterday also had some nausea and cramps?

Possible flu: Persistent symptoms like this could be caused by influenza & a test (nasal swab) would be helpful , especially to guide you regarding avoiding contact with others. If the test is negative you probably need a full evaluation for other causes, though you could wait a couple more days if no abdominal pain, no urinary problems, & you are able to keep fluids down & not get dehydrated