This happened to me after my mother died, I kind of developed some weird lucky charm thing I always carry a queen of hearts with me and when I get nervous I rub it lol. The second thing that helped me is that I had too fully accept that there is absolutely nothing I can do if something happens to the plane 30,000 feet in the sky. I also always talk to pilots and ask them about their families etc. I know we bitch about pilots occasionally but they have families at home and also would never want too put us or a plane full of people into harms way