There's probably nothing I can say that will change your mind, but if you are really at the bottom, one way to look at it is that there's no possible way but up. I think a lot of people have been at the point you're at now. The one thing I think most people won't actually admit is that it's the one truly defining moment in their life.

I genuinely hope you make whatever the right choice for yourself is. If you need someone to talk to, don't hesitate to let me know.