The hardest thing for me was that I still loved her, but of course rationally didn't want to (mother of my 3 kids). One trick I used was to disconnect the real person with the person I loved. This allowed me to still love the person in my head, but not the real one (sounds stupid but it really worked). Basically "the person that I love is in my head and doesn't exist. The real person just looks like her".
Rock bottom means you have nothing left to lose, or at least you feel like it. For me it felt kind of liberating. Because if you have nothing left to lose, there are only things to gain. You can take stupid risks and it won't matter anyway.
Your breakup is still fresh, so try to talk to some friends who went through a similar thing.
Hang in there, it will get better.