How To Treat Vertigo Caused By Allergies?
It is ok to fly.
Detailed Answer:
I read your question carefully and I understand your concern. Since the going up and the landing part of the flying are associated with pressure changes in the ear often with some pain and sensation of fullness it is natural to ask if that might affect your balance as well.
However generally these pressure changes which are temporary, during the first and last 30 minutes have a minimal if any effect at all on vertigo and it is not contraindicated to fly.
In order to minimize the symptoms some simple measures can be applied like chewing a gum, staying well hydrated and also taking an antihistaminic drug and a nasal decongestant before the flight (which you are perhaps already taking).
I hope to have been of help.
Meclizine is a common option.
Detailed Answer:
One of the most used drugs to alleviate symptoms of vertigo is Meclizine.
I believe it is available in the US as an over the counter medication approved for the treatment of vertigo or motion sickness. Can cause some drowsiness so keep that in mind if you have to drive or operate some sort of machinery.
Dosage for vertigo starts from 25mg a day and could be increased if necessary to 100mg a day (in three divided doses daily).
I hope you will get better soon.