Its not that women recover fast and men don’t. You were involved in a FMF, where you have to put your entire energy to satisfy both the women while they needn’t stress themselves too much. When its a threesome (FMF), they guy would be drained from the session, be it a single night or as in your case an extended one. Its like you’ll have to put all the effort while the women can have a good time.
Of course their vaginas would’ve become sore but its nothing like what you’re facing, because they are 2 while you are 1. And moreover women have the ability to enjoy multiple orgasms unlike us, and as for the soreness, all they need is some much needed rest for a complete night with no one bothering them, that would help them get back.
For your current state, I advice you to have some good food, not the fast foods, but some food filled with high levels of nutrition’s to get you back in shape and have rest, you need it big time. You needn’t have any medications or that stuff, just don’t touch your penis until you feel normal that might do it.
Whenever you plan on having sex, have some nutrition bars or some chocolates or fruits which provide your body instant energy or carbs, it helps you stay energetic. You also need to keep yourself hydrated, since you would literally be drained from all the hard work you put in while having sex.
And a small follow-up on your previous post, have you succeeded in making that girl (the chubby one) happy?