Oh yeah. I just wilt when it's hot and humid. It saps all the energy from me.
As for hands swelling up, fingers going numb, etc, this only happens to me when I am walking/hiking for long distances and keep my hands down by my side. I do swing them back and forth so they aren't hanging like limp noodles or anything, but having them always down like that seems to pull all the blood to my hands and causes them to swell up.
When I feel my hands start to go puffy or numb, I raise them up to waist level in a jogging position and start clenching/unclenching them to get the blood flowing right again.
I don't know if that's what is happening to you, though.