Are you sure you have allergies? I also have adenoid problems and post nasal drip. I thought I had allergies so I pestered my doc until he sent me to an allergist for testing. It turns out I have no allergies, but I have vasomotor rhinitis. Allergist said it is common in women "my age". (Hotflashes are also a vasomotor thing)
He said the sinuses react to certain triggers as with an allergy, but there is no histamine involved. I don't remember all the details. Maybe you can do a search on it.