HELP! with my stupid nerves..?

ok, well to start off, i have been showing for a while now, and always have gotten nerves on the morning of..who doesn't right? so now, i have rodeo's every month, and i get nerves in the morning, as always, but they are 1 million times worse. I actually get sick, and i end up being sick the WHOLE day. I've tried many different things to relax and make them go away..but nothing has really worked..and remedies that can help me? i really don't wnat to ruin anymore rodeo's just cuz i'm sick...and, before you answer, just know that the whole "mind over matter" thing doesn't work for me..i've tried. everything. HELP!