Welcome to Wrong Planet.
That sounds very frustrating, i'm not sure why they would be so hesitant to help you, all the contact i've had with the mental health field here (in Australia) has been a very pleasant and professional experience.
Sometimes, and this is based more on misconceptions than science, it seems that middle aged people, especially females tend to slip through the cracks when being identified as being on the spectrum. I think it's largely to do with the more common conditions such as mood disorders being misdiagnosed as the root cause simply because they're the easiest to identify and most prevalent, but also because for some reason that i've never understood, there seems to be a belief that there is a gender disparity when dealing with autism. Also, many assume that autism is picked up early, which in my case it was not (diagnosed last year), and in many others, perhaps you as well, it has been missed.
I hope you find someone you can get along with, it can really make things much easier.