What I have learnt through my experiences as a disabled trans person is to work out what I need to say before going to medical appointments. I try to plan and write down things in advance, this helps my anxiety and means that I do not forget what I needed to say, and important things are not missed.
I have encountered access issues just trying to physically gain access to my GP surgery. The GP provided in my local town offers 2 disabled parking bays outside. However, neither bay is for wheelchair use, and so does not have the space next to them to be able to get into/out of the car into a wheelchair.