All great advice don. I have been doing some research on the web and will continue to do so, but I never thought about talking to a pharmacist before - I know a few and will question them.
As of yesterday, I visited with my 12th doctor. When questioned about diving, he listened to my concern and brief explanation of what happens physiologically to the human body at depth. He smiled and said he didn't know of such occurrences. He went on to say that he had no reason to think that meds should stop me from diving. This is the basic answer that I keep running into when speaking with non-diving physicians.
Anyway, on a brighter note... Because I have learned these CNS depressants seem to have a strong tendency to cause a narcosis rather than an oxygen toxicity problem, I have been thinking of a possible training program. The program would start with 4-6, 30-45 minute pool sessions where my wife and I can see how I react in shallow water. If all is well, then I'll work on proper weighting and buoyancy control, do a full review of all 18 demonstration skills and all emergency procedures. Then, if all is still well, I might consider entering our favorite training site where there is a very gradual slope to 25', and see how I do. After that, there is line available that drops down to 42' that I can consider trying.
Another idea I have is, barring the possibility of an oxygen hit, I'll ask some trimix instructors about the possibility of using a hyperoxic trimix (something like 26/20 - 30/30 maybe) at recreational depths with idea being, to take as much nitrogen out of the mix without increasing the risk of an oxygen hit (which still looms in my mind). I think SSI was offering a "recreational trimix" course about the time I stopped diving. Anyway, I'm just thinking...
Any further thoughts, ideas or chastisements are still appreciated...
Semper Fi, Dave