Hi im traveling to thailand soon from Australia it is quite a long flight about 8 1/2 hours. I am scared of flying and in the past have taken 2x 2mg diazepam(valium) which only took the edge off thats about it. I have never flew this far before and am very anxious i would preferbly like to sleep the hole way instead of being scared the hole way, is there anything i can take for this? Will a higher dosage of valium do the trick?