I don't know what Alan would say about this but for me I think we can learn and unlearn any thing if we really want it to and act on it persistently. All of us were born innocent just like a blank piece of paper. Everything we know, everything about us we learned it, we acquired it from people and the environment around us. So try to pick good companies to be with, choose a peaceful environment to live in, follow the right teachers (Alan, Sarno, Steve, Weekes, ....) then start living a new life.
Think of "quitting" fear just like quitting cigarette or Alcohol. They are all habits we want to get rid of. It is not easy quitting something we live with for so long. But it can be done. Lots of people have done it successfully. Make a commitment to work on it and start to replace your bad habits with new and good habits. Day by day, one by one, chipping away your fear.... then boom, one day. One bright and beautiful day you will get there. Fear just melt away before you know it.
I used to fear everything just like you. What if this, what if that all day long. I couldn't eat many kind of food, I couldn't fly, I refused to drive over high bridge (and they are all high) or go through a tunnel. I afraid to open the mail. I worry about every body sensations I've had, fearing it is a sign of something bad is going to happen. .... I worry and fear everything. That was 15 years ago. And now, no more. I am fearless. I have walk the Golden Gate bridge. I Flew to Thailand and many other countries many times. I ate all kind of queer foods, just like Bourdain. I laugh at pain in my body....
You can do it Yael. I was the most fearful person on earth and if I can do it so can anyone.