The best obsession-killer I ever started was taking up jogging.
Mind you, I'd never been able to run a hundred yards; I'd get winded just walking downstairs for coffee and danish.
So I started doing the running programs on CoolRunning.com and pushed my body so hard that all I could do was collapse on the carpet and fall asleep. I'd even TRY to think of my XABF, and my inner voice would say, "**** you, I'm too busy to deal with that ****" Seriously, too tired to care. At all. And I slept well, which made me even stronger. Worked for me, anyway.
Stay busy, ago, doing things you love and being with people who treat you great. Multiple good nights' sleep, B vitamins, natural light, fresh air, and your support group.......and you will heal.
Then, the world is your oyster.