I have a stuffy nose and lots of flem everyday for awhile now...i thought it was allergies but im beginning to think i have sinus issues i get headach?

Allergy, sinus, both: It is difficult to separate allergic rhinitis from sinusitis. While colds resolve over 7-10 days, allergies can have ongoing symptoms. Sinus infections can be a complication of a cold or allergies. Typical symptoms are nasal congestion, post nasal drip, cough and fatigue. The mucus may be discolored and frequently there is no fever. Bad breath is common. Sneezing and itching are lacking.