B.D.
When it recurs over and over the physician should be looking for an underlying cause. More than likely it is allergies which I have heard are worse this year than ever. So even if you haven't had a problem in the past it could be a problem now.
Have you tried taking an allergy medication? Claritin/Loratidine is over the counter and does not cause drowsiness. At night when you are ready to fall asleep you could also take Benadryl. If this helps than you know you are on the right path.