If numbness would help I think you should be using Lidocaine gargles before eating.

Many times things that affect people, are very unique. Trying to find a medical report to confirm your experience can be a dunning job, and waste time while you suffer. Sometimes only 1 or 2 or a handful of reports appear for decades!

Treating the problem for what it is, may be more practical.

Chronic sinusitis, with no history of allergy? That is unusual. Sinus drainage down the throat may constantly irritate tissue there.
You can get chronic sinus infections from dying teeth in the upper jaw.
The nerves may be injured from a filling, and then slowly die and infect the sinus above. (this happened to me once--- it was awful and took 4 yrs to diagnose)
The back molar never hurt itself, just drained bacteria into the sinus above, and when I had a case of lockjaw from the irritation of the jaw muscles, then the series of specialists began. Even with 3 specialists no definite diagnosis was available to me, so they decided to root canal the devil. That fixed it.. after 4 weeks of suffering from the root canal...it was a nightmare.

I've been on this and its cousin board for over 10 yrs. Not one person has come on with a situation similar to yours. The closest was a phrenic nerve injury from surgery (affecting the diaphram). That is why you need to look at your problem from outside the box. Ask your doctor would botox relax those muscles? Can lidocaine numb you enough so you can eat safely? Things like that. Would inhaled steroids work? (these have less side effects than oral steroids).

Here is an article I found. There is no Lee Woo. His name is Peak Woo MD.
http://www.wchstv.com/newsroom/healt...ife/2234.shtml
The other doctor in the study is Dr. Bryant Lee MD.
And according to their study, relief came in months for most of the patients.
That is ...those people healed up. Why you are NOT healing should be explored.. constant inflammation, infection, whatever, is keeping you uncomfortable.

The word neuropathy means damaged nerves. They can be anywhere.
If your nerves were severely damaged, you would not be able to talk, swallow at all.

We have many posts here that discuss how to help our nerves heal. There are two right here on page one to read.

One very common cause of chronic cough is ACE inhibitor use. These drugs are used for blood pressure and raise Bradykinin levels. Bradykinin elevation :
http://www.med.ucla.edu/modules/wfse...?articleid=135
This article explains bradykinin a bit... it is a very complex biochemical thing.
http://en.wikipedia.org/wiki/Bradykinin
But it mentions bromelain, as a bradykinin inhibitor as well as aloe, and red wine (you can by the polyphenols in capsule form without alcohol).
It might be worth a try to control that cough that way.