I wouldn’t expect nurse practitioners to be anything but cautious.
As I said before look for a new Doctor who specializes in treating older patients. My experience is that they are more concerned about your overall health and wellbeing.
If you have been on anything for 18 years for anxiety and depression and have never increased your dosage I go back to what I always say. “If it isn’t broke don’t fix it”
People in their late 60’s and 70’s have enough to deal with these days.
A good Doctor should understand that and just encourage you to eat healthy and get in some form of exercise every day.
For me exercise is the key to feeling better. I empathize for me.
Good luck to you.