same issue here. i find there are two OTC meds that work, but are not the best to take because they're anticholinergics. But they WORK: benadryl at night and sudafed during day. i try not to take more than once a week to once a month (when i've about had it with my throat), so i don't know how helpful that will be for you since you need something daily.
Also, more naturally, you can add Alkalol (amazon sells it and others) to your netipot, and after nasal rinse, swish and gargle with the last bit of it. This was recommended at my last ENT visit. Also just gargling with ½ tsp salt in a glass of warm water is very soothing.
hope you find something that helps. if you do, please share.