Man, I so want to be mean and tell you to grow a damn spine but...
Look, when you divorce it really is like a death in the family. It's a very traumatic event for pretty much anyone who goes through it. It isn't easy, it isn't always amicable, and you don't always have a choice in whether or not someone will love you and want to be with you.
You're floundering in a well of emotions that are about to drown you. Please go talk to a counselor about this, talk to a dr perhaps get some medication. It does get better, but you do need professional help and there is absolutely no shame in doing this. Between my divorce and another relationship ending very badly I was seriously contemplating hurting myself a few years back. And, that's frankly a stupid thing to ever do.
Please get professional help. You're not alone, you're not unique in what you're feeling, and there is help available. It's worth your time and money and effort to move past this and find someone who is willing to share your life with you as a partner willingly. There is absolutely nothing you can do to get her back if she doesn't want to get back together with you.
Please get help.
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."