So I went and got a prescription from my doctor for valium for my flying anxiety. I am flying to the UK (about 7 hour flight) and was really freaking out. She gave me a prescription for 5mg tablets and told me to take 1-2, she said because of my weight I may need the full 2 in order to feel the effects. At her suggestion, I tried taking 1 tablet last night to see how I do. It knocked me right out, and today I am feeling a little dizzy and unbalanced. Is this normal? Did I take too much and maybe should try a lower dose when flying? Any advice would be appreciated.