Eat..drink...Eat...drink...Eat...and keep it cold in the cockpit if you can. My first contact flight was in january, and being the systems stud that I am, I didn't know how the eff to turn the AC (called an Evap Blower, wtf is an Evap Blower?!) on. I'm wearing a jacket, g-suit, and my thermals because it's balls cold on the flight line, but as soon as that fishbowl closes...its like 9000 degrees and my visor is fogging up from my sweat. Great. After a few fun aerobatic maneuvers from the IP, and a tour of the Aux field, we RTB. I'm feelin queasy, but still doing my best to use the stick to make the houses get bigger and smaller in the proper order.
When we finally get back in the pattern at home, I finally pipe up and ask the IP if its alright to turn the AC on... he's like yea you idiot, turn the evap blower on (DING! LIGHTBULB in the brain goes off). I start cranking it, and within 5 minutes i feel much better, even with the g's and moving my head around to scan in the pattern. Never felt bad again, even during forms with a lot of maneuvering. Bottom line: never wear your thermals if you can avoid it, and if you learn nothing else in systems, learn how to use the AC...stay frosty.