In addition to what others have said, do you maybe have a close, local friend that does understand you? If so, you could maybe go together to the doctor and they could make sure that you properly advocate for yourself. There’s no shame in getting this kind of support, it’s kinda time-critical that you get this health issue sorted as well as possible, don’t necessarily want to wait until you are able to be persistent by yourself. We humans are meant to face struggles together.
That’s not helpful of course if you don’t have someone like this, but I thought I’d mention it.