I don't have much to contribute for lack of experience with the field, but I want you to specifically and deliberately renounce what you say in your last paragraphs. There is nothing WRONG with you. This is a tough situation, a lot of people of lesser caliber would've already crumbled, and you're GOING to solve it and move forward with your life and very likely with your career. Breathe. It sucks. It's okay that it sucks because it won't suck later.
You got this, friend.