Flavia, do yourself a big favor and get that divorce.
I went back and read some of your posts. You don't need this man in your life. He's not a good guy honestly.
He was absent, strip clubs, porn, drinking.
You said that he wandered off in to his new happy life, well the call from the girlfriend proves otherwise and is it any surprise (honestly, what the hell was she thinking calling you, that's so weird)?
He didn't walk out your door and all of a sudden become that "good guy" - he walked out and is just as he was. Selfish, self centered, rude, unkind etc.
If he doesn't want a divorce it must be for some self serving reason. Does he pay child support does he pay alimony? Would he be liable for either if divorced or would the amounts go up?
As mentioned, even talking to a GP about your feelings of sadness will help. Seeing your therapist again is probably a good idea too. It's hard to dig your way out of depression and panic etc without help and why not ask for that help anyway.