ok, so what is xiadidi to do? He only has two days left so "rest"is not an option.
Sorry, I thought you just had trouble getting it up. There are other recommendations in those links both drugs and natural herbs (and more related threads in search engine too).
As I said in post#13 of the first link: "it's all in the mind ..... I can't believe sometimes being with a fantasy WG, I still have another fantasy going on in my head to really get off. The worst thing is the distracting thoughts, which is where invoking my own personal 'fantasies' comes in when I need it." But that's me, everyone's is different.
I also mentioned DHEA which I find quite a good stimulant/aphrodisiac and can be reasonably quick acting. It's usually when you take it too long without a break it's efficacy diminishes. Not sure how easy it is to get in HK. Make sure you don't waste your time with the water/alcohol diluted homeopathic versions which contain nothing.
Some guys get a mixture of DHEA and testosterone but in OZ you need a script and it will take some hunting around to find a doctor open to prescribing it. You will need to present with symptoms like lack of zest, lethargy, disinclination, affecting my marriage, etc. (say you tried V but not giving result). Good luck!