Was it Lisinopril? A cough is a recognized side effect of it, but I think something as severe as you are describing would be fairly rare?

While I think you might be overreacting a bit here, I have a similar story. I had an irritated, gunky eye for the better part of a year. Was bounced around multiple doctors, including one specialist, and had all sorts of really annoying treatments I was supposed to do. Finally got bounced to a specialist at a major teaching hospital. Took him five minutes to correctly diagnose me, and the major part of the fix involved instantly stopping all of the things recommended by the other doctors. (The rest of the fix was simply to make sure my eye was protected while sleeping.)

So yeah, I think there is a lot of value that might be added by an expert system that is familiar with the slightly more exotic things that can go wrong with your health.