In my personnel opinion moving around to different doctors is not such a good idea. In my case I began my illness with doing that and I could not get any answers. Some 25 years later, I found one doctor that I liked and believed in and stayed with her. In the beginning they told me the same thing and it wasn’t until after several visits that she started to investigate the fact that I had lupus. If fact it took me almost a year and a half with her to be Diagnosed, even after three other doctors thought I had lupus, including my Numerologist who referred me to my rheumy. I had a very complicated case so part of it was based on the science. But then one day something happened to me and she saw it, and that was it, the deciding factor.
I truly believe that your relationship with a doctor has to be built. They have to believe in you and you have to believe in them. Sometimes it is not all about the science, it’s about seeing what you are going through and wanting to help you find an answer.
Best of luck to you… I know how frustrating it can be.