If I am understanding correctly that you are obsessing about xOW and the past a lot, then I really feel for you. I have been there, in a very different sitch, but I know from personal experience the poison that obsession brings.
I think you are on the right track with your recognition that this is something that your H can't "fix" for you. It's your personal responsibility to relieve yourself of this terrible suffering so that you can live in and create the present. I think you would benefit from IC. I would also recommend doing The Work...it's a very helpful process for questioning the thoughts that bring us pain.
me: 42 | STBXH: 41 | T: 18 | M: 10 | separation: Jan 3, 2010 | they deserve better: S7 & D4 current thread: http://tinyurl.com/3y8sxcp .: first breathe, then heal, then start LIVING :.