So, in your mind, go to the worst case scenario. Embrace it and let it wash over you. Then, take a deep breath and realize that even in this worst case scenario, you still have your kids (nothing will change the fact you're their father or keep you from seeing them and being a huge part of their lives), your health, a beautiful world in which to live and a long life ahead of you with new and exciting people and places to see. So much left to learn.
So, you look the worst case scenario in the eye and say "so what, so f'ing what?". Kick it's a$$. Then realize if that's the worst it can get, you will be fine. Not what you want, but you will be fine.
If you can do this, it has no power over you. And I think you HAVE to do this to get to a healthy place.
If I can do it, anyone else here can. So, do it. And then be done with the fear.
