I had exactly the same issue. And i think what got me through was flying more often. It didnt get me completely anxiety free but i kinda sometimes forget about the fear. And also researching and flying only airlines that are considered safe. Its a bit more expensive but to me worth it. And also choosing driving or train when possible. Lots of options just try everything you can, we are all different something will work for you. Or not and you'll be afraif forever ... then use drugs