I'm sorry to hear that. I have been dealing with post nasal drip for 4 or 5 years now. I haven't thought about my diet too much besides peanuts since I was allergic as a child but my allergist put me on Claritin (loratadine) and Gabapentin. It makes a difference if I take it everyday but if I forget even a couple days it gets bad again. If you decide to get medicine, these are some you can try. I hope this helps some. I feel like it's not something that can be cured but I can't understand why.