Mine sweat whenever I get hot. Those ungodly sweat stains are the reason I resent summer in Texas :P
Lately, I've been using an antiperspirant in addition to deodorant. I think it's helping, but we'll find out once the weather starts to heat up.
Only suggestions I have are antiperspirants, loose clothing (preferably cotton -- let your body breathe), and try to relax some. You could also carry some baby wipes in your purse if you have time to slip into the bathroom every now and then.