It's torture isn't it? We panic and feel have to do SOMETHING, ANYTHING.
It's hard to stand back and watch this trainwreck.
I can tell you though, you will not get the response you want if you call her and beg her stay. You will feel worse that you do now.
Many people have tried it over and over again here. I've NEVER seen it work.
Your W needs to respect you before she can feel attracted to you again. Telling her you love her as she walks away kills her respect for you.
From what I've seen, its when the WAW see's the LBH start to move on (move on for real - not fake it) that they start to come back around.
The hard part is that it takes a long time to actually move on from WAW. Thats why DB stresses GAL and detachment. It helps the LBS start to move on.
DB does work, not always, but enough to give it a shot. It's worked for me in the past. I'm back again, but I was able to get her back.
Obsessing is where I struggle too, my mind is literally my worst enemy. Replaying things over and over again. Replaying conversations, good times, all that stuff. All you can do is try to distract yourself as best as you can.