Sorry to hear about your medical condition Bro.
There are a couple of things that I can think of that might help you:
> You have one advantage in that you speak fluent Mandarin.
> The majority of the walk-up girls also speak Mandarin, and quite often they have laptops with internet access in their rooms.
I'd suggest that when you go to see a girl, you start off by calmly explaining your situation, and try and steer them to verify your facts online. Perhaps you can scope out some Chinese language medical websites in advance that will provide the re-assuring answers that you need the girl to hear, and then help the girl find those same sites. You can also offer to wear gloves if it might make the girl feel better, even though it is unnecessary from a transmissible perspective.
And if the first girl you try doesn't accept you, don't give up. I have to believe that there are girls out there that aren't steeped in witchcraft, that will listen to you, and moreover, will happily take your money. And being white won't be an issue at all.
Good Luck.