Make sure and drink LOTS of water, and wash your face as often as you can. I know this sounds impossible but make sure to keep yourself as cool as possible. Take some towels/rags with you to work, and keep them wet so you can wipe your face off and keep them around your neck.
doxycycline, its an inexpensive antibiotic, you can take it long term. also if you are female you can get a yeast infection, so if that happens, just take the doxy every few days, or just during your period