That is complicated and it does sound like the vacation holidays were a good "test." I'm not sure about the L% degeneration and certainly with aging, it is possible to have to change your approach to achieving orgasm - you don't mention if you are fully menopausal, have vaginal dryness issues, etc.
If you are getting aroused and your husband is sensitive enough to note the letdown - then I would think that's a very hopeful sign. I would look at a university hospital (a teaching hospital associated with a medical school) and call the Gynecology department and see if there is a doctor/professor who specializes in sexual disorders and conditions. The large teaching universities tend to have doctors who are highly specialized in their fields.
Good luck