Maybe just to echo the advice above --

As the short term fix, take some medication to knock yourself out for the most traumatic part of the flight, takeoff. Rather than focus harder and harder and make yourself more and more anxious, just block it out through medication or releasing your mind to not think about it, just as every other passenger seems to do. Just tell yourself, the worst that could happen, is not that bad.


In the long term, I would find some therapy to understand what your deeper anxiety is about.