You are way over reacting man. Yes, any blood present is going to make transmission easier but that doesn't mean you're anywhere near high risk for HIV.
Transmission male to female is 1/2000 IF the person has HIV.
Sorry, that should read female to male.
Man, I am in the same situation like you. Also in China, also afraid of getting tested here due to my work visa and residence permit. I finally decided to fly back home to do the test in my much more liberal home country.
But as snippets said, your risk was not extremely high. So you can maybe risk to do the test here in China or you go to HK. Hope, you will be okay.
DON'T let this get such a hold on you that you leave your life in China...
Insina too..Come on man...Pull yourself together.
Neither one of you should be losing a moments sleep from this. Do you worry about lightning hitting you? Or slipping on some chinese noodle soup and breaking your head open on the sidewalk? You have a better chance of both those things happening than getting HIV. Come on.
If your condoms keep slipping off try choosing a type and size that fits or if they are slipping off due to erectile dysfunction see your Doctor about it or if you are carryng on after ejaculation don't. Maybe none of the above are applicable but the problem is something you need to consider to avaoid the situation in th future.