Sorry to hear it, man.
First, get the legal stuff going. If your uncle is going to help, put a petition together tonight or tomorrow, then get it filed and served on Monday. Just get the process going - you will feel better.
The second step is to cut her off. That's another good reason to have a lawyer. Force all communications to go through counsel. Be sure to tell her that you're no longer on speaking terms and that you are not going to be friends. Don't take any whining, etc., just tell her no and put a stake in the heart of the relationship. It might sound bad, but you'll start feeling better almost immediately.
Now is the time to take up a new hobby or interest. If DIY interests you, go get a soldering iron. Or take a week in Europe, go on a road trip, learn a new language, get another degree, whatever. You need a big project to work on. If you find yourself dwelling on things, pick up the soldering iron and get busy. It'll keep your mind off things and you'll be happy with what you build, where you go or what you do.
Reconnect with your friends and make new ones. Go hang with the guys. Have a few drinks and have some fun. Don't go overboard or make a mess of things, but going out for a few drinks every night will make you feel better. Becoming a "regular" at a bar is a good thing, too. You will meet more women and you should take one out for a spin. That will help a lot, since you probably feel sort of worthless, unattractive and undesirable right now. So pick someone up at the bar who will make you feel good about yourself, if only for a night or two.
Oh, and if you aren't booked for CanJam, drop everything and make plans. You will have a good time, I promise. I'll pour beer into you and I'm sure quite a few others will, too. There will be lots of people to talk to, food to eat, screwing around, possibly some troublemaking, and so on. So you have to be there.
Anyhow, you will get through this. I'll spare you the horror stories of my ex-fianceé, but you really do get through this crap. I took that relationship out behind the shed and used a blunt instrument on it, much like I recommended above. Right now, I'm happily single and have a lot of fun. I do what I want when I want, go on vacation where I want and there's never a problem if I take home someone from the bar.
Also, if you need support, someone to talk to, or whatever, PM me and I'll send you my number.