Starting late lastnight I started feeling really hot and just super week and nauseous could this be an infection and should I go in?

Check for fever. Feeling hot could be a sign of a fever. You should check your temperature since this can often help decide whether you need seen or not. A frever is often a sign of an infection (viral or bacterial). Your other symptoms, weakness and nausea, can be caused by many things. You can call the triage system of your hospital to be more specific and see if you should be seen.