Re: sex... is there anyone with whom you're already having great awesome sex who would be willing to help out with some desensitization? For example, adding role-playing "our first time" to your repertoire? If not, how would you feel about hiring sex workers for this purpose?

Re: lifestyle... list the novel factors (dancing 4 hrs/night, spending time with people rather than alone, sleeping <7 hrs/night, diet changes, etc. etc. etc.). When you're back home, identify the ones that are easy to introduce and experiment with introducing them, one at a time, for a week. If you don't see a benefit, move on to the next one. If none of them work, try them all at once. If that doesn't work, move on to the difficult-to-introduce ones and repeat the process.

Personally, I would guess that several hours of sustained exercise and a different diet are the primary factors, but that's just a guess.