Be careful with bee pollen, they might contain the pollen you are allergic against and provoke an attack.
Acute, threatening symptoms can be downregulated with inhalative steroids, which are supposed to have no systemic effect; if that means promotion of osteoporosis it´s wright, but you have a higher risk of fungal infections (candida) in the mouth and pharynx.
Subacute symptoms can be relieved with non-steroidal sprays, which contain H1-Blockers.
Best way would be to find out the allegene and then try to stay away from it. Or, trying to get a desensitization therapy, which takes some time.