Hi Tattle
Welcome to NeuroTalk - I hope that you will find that community as knowledgeable and supportive as I have

.
I am sorry to read about your partner. While it is good that the doctors have ruled out some things I am unable to follow their alleged reasoning that "
they could do more testing but whatever it would turn up being, would be incurable anyway" - this seems totally evidence-free to me.
I hope that other NT members will recognise some of your partner's clinical signs and post ideas here. That could help you and your partner to prod his/her doctors to do a bit more.
Best wishes.