It took me nearly a year to start feeling ok again.but i was a pretty slow learning back then!
I remember being so gutted. And feeling like i had to keep a smile on my face. I was well known at the time and i felt like i had to appear perfect because so many people admired me for the things i was doing, and i felt like i couldnt let them down. I didnt know what do with myself and totally dropped out of sight from the world. I thought about my ex t almost constantly. I didnt eat, couldnt eat, and ended up in the hospital- a month after my t dumped me i nearly died, and then i was just a real wreck.
Oh, a couple hints of things that helped me eventually:

To help myself stop obsessing over the whole thing, i started listening to my iPod almost constantly, even when i went to bed. I chose to listen to podcasts and sermons by Joyce Meyer so i had to listen to other peoples words not mine.
I started looking for people to be blessing to. Taking care of other peoples needs helped me take my thoughts off a little about me and obsessing over the thing with ex t.
I also read constantly. With my music playing in my ears constantly!
I took a lot of naps.

Also, when i finally found a new t after 2 years, itwas really validating when i told her about what happened and new t was soooo angry at old t (she still is actually!!) new t thinks ex t is a total B i t c h and what she did was totally unethical. (Same for your t!!) and new t didnt want to see any of my old notes or records from old t-- she said she didnt care what that B said about me, or read anything she had to say