Always getting sick on planes. HELP!!?

I'm going on a long plane ride tomorrow for the first time in 3 years. I'm flying from Philly to L.A. for the Holidays and I have a phobia for flying and I get air sickness. Ever since the 9/11 incident it's been like this. Last time I just tryed to sleep through the whole thing, but I woke up and threw up on my dad. I had threw up 7 times during that flight and I was so embarred. How do just calm my nerves, and stop being scared of airplanes, and stop barfing. I am extremely nervous. Help!!!