Can one get off sleep meds after many years?

I am 86 years old and not really a depressed person. Most of the anxiety I have is connected to sleep. I have chronic insomnia and have been on sleep medication for 25 years. I have taken the course in CBT-I. I believe my sleep hygiene is pretty good. But I can’t sleep at all without medication. But where I live, almost all doctors are associated with the same organization. After 25 years of trying and using many different sleep meds, it’s becoming more and more difficult to find one that works. When you do, it no doubt is a controlled substance and doctors here don’t like to prescribe them. One doctor even refused to help me after that. And some don’t like to because of my age and I might fall. So you are put in a category that basically says ‘all old people are the same’. So my question is, does anybody know if there is some sort of rehab facility similar to what there is for illegal drugs, for long time sleep med users?