(((Belle))) I am and amateur and new to this sight, and have been reading your sitch.
I know how you feel. My H actually had an A 4 years ago, but we decided to give it a try and I had a hard time letting it go. Here we are now-he is moving into his new place today, but we have been seperated for 4 months now.
The only thing I can tell you about getting over an A is that you have to work on yourself. It is so very hard, and I am realizing 4 years to late all the things I did wrong.
As far as DBing goes, I am like you. Sometimes I want H back so bad and I hurt for him and all I can do is cry about it. Then there are other days that I feel like I am more at peace without him. I worry a little that detaching for me will lead to me being done. Right now though, I am working on me and what happens happens.
Just give yourself time to find out what you want in your life. I think that part of GAL is that if your H does come back you will be in a better place to decide if that is what you want and if not, you have your own thing going on.