Does anyone have any tips on stress from upcoming competitions?

Iga

Hi guys, I am an equestrian of 4 years. I have no problem being in a lesson but if there's a show on? I get severe anxiety-like adrenaline (almost, idk how to describe it), with horrible side effect kind of things like gagging too much times to count, runny nose, uncontrollable shaking, there's probably more I'm missing. Does anyone have any tips on how to help? I'm really tired of how my body is making me act sick because of the thing I love.