At 71, and in today's healthcare industry, (I call it an industry because that is what it has become) I am no stranger to waiting lists. I was on a waiting list to see the neurologist I have now and I literally called every other day to see if there had been any cancellations. It eventually paid off and shaved 20 days off of my wait time. Rest assured I will request to be put on a wait list every time. In fact, I'm on a wait list to see the nutritionist that I have an appt with in November. I don't bug them about cancellations too much, as he gives priority to cancer patients which I can understand.
By the way, and this is probably a stupid question, but have you looked at the website "The Patient Revolution"? It was recommended to me by @johnbishop, another of your volunteer mentors. I am so grateful to him for telling me about it. It's extraordinary.