My husband is having a terrible time with this. He gets it for a week or more after he swims. He has been to the allergist and the ENT. They have given him every spray and allergy med humanly possible. It does not help. I did some research online, and I have concluded that in his case it is not an allergic reation, but an irritation of his sinuses.

As soon as the current problem clears we are going to the nose plug.