Antihistamines do little good. After several years, chronic sinusitis developed, eventually requiring surgery. I have the usual manifestations of AS including fatigue and intestinal problems. Concurrent with the onset of AS, I developed what seems to be a dysfunctional immune system that leaves me susceptible to every respiratory virus I encounter. Also, I have numerous chemical sensitivities, am somewhat allergic to some things, like molds, and in addition, seem to have allergic symptoms that have no known cause and are apparently not IgE mediated.
Antihistamines do little good.
After several years, chronic sinusitis developed, eventually requiring surgery.