Kendall--the Dr. could well be right about the callous, it does often happen. Geez, wish we were somewhere in the same vicinity as I've helped many a vocalist make the best of what vocal folds they have left after surgeries. Perhaps you can ask around at some of the local universities & see if there's a vocal instructor/coach who might be able to assist you with this. There are many talented instructors who know how to help you beyond the speech therapy!   Do go easy on the booze, though. Alcohol is damaging to the vocal folds!