Hi CQ, welcome to the forum. What you describe is agoraphobia at its worst basically, and a couple of other things, though all very achievable in for you to get past "IF" you really want it. The trick to these things is starting very very small, then slowly building your way up, not trying to just take on getting in a cab and not taking details, or going for a walk down the most dangerous street at night (which would just be silly to begin with).

You have to look at what you do in its entirety, being from the smallest to largest issue, then in your case because its so extreme, begin with the smallest first. As you increase beating your own brains protection mechanisms, you then increase the pace, possibly even skipping smaller issues and going for larger ones, which simply subside the more insignificant issues as you beat them.

Exposure therapy is the relevant therapy for what your explaining... and the facts are, only you can make yourself better, nobody can do this for you.