I've been there before, too. Being out somewhere (for you it was the wedding, for me it was a trip to Washington) and realizing that everything's going to be okay if I just keep getting out and exploring life.
And then hearing of friends marriages where there's resentment, miscommunication, etc etc but I'm here with a little one doin' my thang and not having those woes!
I understand being nervous about his emails, too. For me at least, it was that I created my own world that WH couldn't harm. (This is me in NC, that is.) But whenever I encountered him-- either directly or through other people-- my peace could be shaken.
It might be a good idea to leave the email be until you're ready to check it. Don't check it when you're feeling low. Instead, when you're about to go out and do something new right after. Then you've got a quick distraction to take you back to peace-land.
Anyways, you're on the right track. I'm really glad that detachment has come easier now. Just wait-- in 3.5 more weeks it will be even better!