Delurking here to get some opinions on what has happened to me in the last 5 months.
History:
1) I've got a lifetime of some sort of "repeating" of my food (burping up bits and reswallowing, sorry I know that's gross!).
2) 20+ years of heartburn enough to require me to keep a supply of antaciRAB handy; have been on 1 Prilosec a day since they went over-the-counter
3) Gallbladder went bad this past Deceraber (it was removed in February, have had a great recovery from the surgery).
4) Knee / shoulder pain developed about a year ago, requiring semi-regular Advil (2-4 tablets a day).
4) Started a new blood pressure med - an ACE inhibitor - a few days before New Years Day
5) Started having nighttime coughing about a week after that. Coughing is a known side effect of the ACE inhibitor class, but this was nighttime only which doc thought sounded more like GERD than the BP medication.
6) Subsequent experimentation with stopping the ACE inhibitor suggests that it is in fact not the culprit.
7) However, massive increases in the Prilosec (I'm up to 2 tabs morning AND evening) had *zero* effect on the coughing - which was becoming really nightmarish.
8) Being stupid (like thinking I could have a glass of lemonade early evening and just taking Tums to counteract it) were... educational (and unpleasant - guaranteeing a bad night). Only did that one once for sure!
9) Gastric emptying showed no delays there.
10) Reglan didn't help (and is contraindicated for me anyway).
11) Narcotics (e.g. post-surgery) stopped the coughing WONDERFULLY but of course these pose their own set of problems

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12) Stopping all NSAIRAB - as unpleasant as that has been - has not helped.
So 10 days ago, doc and I decided it was time to go to a gastroenterologist for whatever tests he thinks appropriate (scoping, barium swallow, manometry, etc.). I called that afternoon for an appointment - and that night my coughing stopped.
Since then I've had perhaps a handful of episodes where I've either felt faint scratching, or actual coughing (as in, one night where I coughed). I've even eaten tacos - with salsa - at 8 PM - and had no problems.

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Now, either the doctor is soooooo good that simply speaking to his receptionist cures what ails me.... or something ELSE happened.
Could I have a hiatal hernia that suddenly got worse in January (when the coughing started), progressed for 4 months, then decided to slip back into place???
Could something like medication *mimic* GERD? (thinking of the BP medication causing GERD-like coughing at night only). The coughing stopped about 72 hours after my last dose of the ACE inhibitor (though previous stoppages had no effect).
I'm obviously keeping the doctor's appointment (that's in about 2 weeks).