I had that problem back when I was younger and I went to the gloves thing. I would suggest wrapping grip tape on the sticks if you do use gloves or they will slip outta your hands gloved as well. use a towel and keep your hands and forearms/wrist dry between songs.
I have another idea
I suggest that you sandpaper down the drumsticks finish and smear them with beeswax. This will make your grip better the more you sweat.