MATE. FEED.
So, like I said, my advice is just about s**t but I'll try.
My suggestion, tell yourself that it's all a lie and it's impossible if you want to stop. Push the thoughts about her away, keep them hidden. Get somethnig to occupy your mind.
And eventually you'll forget about it.
...That's what I did when I was in your situation.
>.>
Not much help, but eh, I tried.
KILL. REPEAT.