Any other remedies for a dog with severe allergies?

My 6 year old dog has had severe allergies during spring and summer times. She’s alergic white oak trees and numerous other things that she is surronded by where we live.

Our vets are North Shore Animal League have tried numerous different medicines and even a steroid to help fight it, which all worked for a little while but now seem to have little to no effect. Not to mention the steroid changed my dogs personality completely, and we will never do that again. She was on Apoqul, Zrytec, a steriod (don’t remember the name) and a few others I can’t rememeber.

Any other suggestions to help fight her allergies to at least keep her comfortable during this time of the year, to the point where she isn’t kicking and bitting herself non-stop.

Thanks!