HELP Allergies, Post nasal drip?

I weas recently dignaosed with allergies to many indoor and outdoor triggers, namely all grasses, maples, ragweed, dust, mold, and cockroaches, and although I started taking flonase and allegra, which seems to be helping at least marginally, I am still having a big problem with post nasal drip. I also seem to have a ball of mucus in the back of my throat, and due to so stated ball of mucus I am constantly coughing and clearing my throat, which is really disgusting, I know lol. I also have a sore throat almost conatantly and subsequently have trouble swallowing a lot of the time. This is really starting to affect my quality of life, Im running out of ideas as to how I can rid myself of this **** for good. Oh I also have a deviated septum. And I use a neti pot religiously twice a day erday, and get relief from using it for about ten minutes afterwards. Help please