Have been ill w/ respiratory illness. wondering when to go back to work. don't know if fever was present, but none currently. feel lousy. fatigue.?

See an MD: Feeling bad and tired is a recipe for ineffectiveness in the workplace. Worse, you may infect your co-workers. Seeing an md to help with your symptoms is needed, and will give you information about contagiousness and when it is appropriate to resume work. Feel better!

See your doctor: Having these types of symptoms can best be solved by having your doctor perform a thorough evaluation. Only through this type of process can he/she discover what's going on and how best to help you.