I had bad allergies past 2 days. istarted to develop a fever, sore throat, aches and a bad sinus like headache. could it be a sinus infection or flu?

Rhinitis and fever: It is sometimes difficult to distinguish a viral infection from an allerlgy attack. Both can produce stuffy and running nose, sneezing and coughing, and face pain and headache. A severe kind of viral infection, the flu, usually has severe fatique, body aches, and high fever. If the symptoms are mild, you can rest and treat yourself. If you are very sick, you should see your family doctor.