It's an awful feeling to be afraid of flying. Could you check in with your doc and get him/her to write you a tiny prescription for something to calm you? That's what I have done. It really makes a big difference ... I still say to myself, "please God, please God" when we take off and land, but I don't feel panic.
The other thing to do is to repeat to yourself as a mantra... "it is safer to fly than to drive." Think realistically about the number of planes that take off and land, every day, all over the world, and then ponder how many times out of those hundreds of thousands of flights, how many times does one crash? Then think about how many fatal car wrecks there are in the same time period. My dad taught me that trick years ago ... focusing on the fact that air travel really is safer really helps me!
Good luck and have a GREAT TIME!!!