I understand from personal experience how hard it is to ask for appropriate help from a dismissive doctor. I didn't want to go back to ask after the first brushoff. Partly from the overwhelming sense of inertia and fading ability to take control of my situation. Partly because of the sense of futility. All that effort to go back, only to not be listened to, given that my capacity to argue my case and push for something appropriate was diminished to the point that a non sympathetic doctor could interrupt and dispense with me before I could work myself up into formulating an argument as to why they should not. Net result lots of effort just to end up feeling worse than I did before I went.
So I wrote it all down. What the problem seemed to be, the potential causes of the problem, the degree of my incapacitation and laying out what sort of results I wanted from any treatment. Lots of bullet points to make it easier for him to read quite quickly.
Took hours to write, not least because I was doing it in my second language and even when at my best I procrastinate against writing when it is not in English.
Did work though. He read it somewhat huffily while I sat there at his desk, which meant for once I got to "say" my piece, ALL of my piece, without interruption and being cut off, and he was unable to minimize what I was telling him by forcing me into silence before I'd finished. I think the concrete nature of having something written down also spurred him into a less off hand approach for fear of being seen as rather negligent if it all went horribly wrong.
I got what I needed in the immediate , and once I had picked up a fair bit one of the first things I did was change my doctor. The one I have now doesn't consider her ears to be mainly for the purpose of head decoration. Which helps lots.
Might be worth a try if you simply don't see the point of going back because you think another brush off is a foregone conclusion and can't bear the sensation it brings of somebody off handly pushing your head under water while you desperatly doggy paddle just to stay afloat.