Im very sorry you're having so much trouble.. I know all too well what thats like, and I pray you get relief soon. I don't deserve it, but God has really blessed me this year. This has been my best allergy year in my lifetime so far.
Allergies are cumulative in the body, so reducing other stressors is huge. Lowering sugar consumption, getting sleep, reducing exposure to molds, decay, and petroleum products can help a lot. I also try to avoid cows milk and non-organic wheat at this time of year.
That's helped a lot over the years, but this year I've actually not been as diligent with avoiding these things as I should... the main thing that has changed is having a really really good water filtration system at home. I don't know if that has anything to do with it or not. I'm just very thankful and hope you feel better. Allergies are miserable to deal with