My advice would be don't take the drugs and just accept your fate.
I used to be super scared of flying with sleepless nights up to a couple of weeks before take-off. I tried sleeping pills and took them at the wrong time so I was super dazed during a 4hour stop off.
Anyway, my wife made me understand that fear of flying was going to prevent me from seeing the world which is stupid if you want to make the most of your life.
Also, if it helps, I try and visualise the take-off and landing like being in a car and accessing a freeway where once you're on it it's smooth sailing. Turbulence is like bumps in the road.
When in doubt look at the stewards. If they're scared then you can be.
ps Why does turbulance always hit when they're serving food and drinks?
pps With climate change, expect a lot more turbulance.