If you have a pdoc I would DEFINITELY ask him/her otherwise your GP. I took valium one time in my life and it knocked me out and I slept for hours. (No idea of the dosage.) Now that could be advantageous, but NOT if you're flying alone.

The other meds for anxiety (that I have personally tried) are Xanax and Ativan. They both take the edge off.

Hope that helps!