Good Advice here...
I would agree with the others on this thread;
1) Accept that you are learning a new thing and your body is going to freak because it doesn't "understand" yet
2) Learn about the physics of sailing so you can say the mantra of "the further it heels, the more force it takes to go over, the more it wants to right"
3) Take the helm. Nothing like taking control (and learning to control the boat), eases the "out of control" feeling. Being an active participant beats the heck out of being a passive "victim" of your fear.
4) Be patient with yourself. Learning something new takes time.
Stick with it. I did and a whole wonderful new world opened up. Feel free to PM me if you want to chat!