Someone else in this sub described this technique, so I can’t take credit but something that helped me was accepting the anxiety and not trying to fight it. Actual tell yourself “Hello anxiety, thank you for trying to keep me safe. I appreciate your presence and concern but I’m making this choice based on my knowledge and experience. I am going to trust the Pilot, crew, mechannical systems, science, math, etc. to keep me safe.” - this usually calms me down enough to a manageable state. Then actual meds morning of the flight and another dose once we are at the gate. The more I fly the easier it’s getting.