Don't beat yourself up over the roller coaster emotions. Just tighten your seat belt and hang on tight. When you are ready you will get off and just watch the ride go around and around. Or maybe even stop watching all together.
The vacation home you love, yeah that would be hard to give up, but unless you have to, really try to enjoy your time there with your friends and or make new friends at a new place if possible.
The mail, have you thought about getting it forwarded to H, requesting that he change his address for this mail so you don't have to deal with it? Or ignore it when it comes and put in away in a box that you don't have to see often and when and if your H requests the mail, then tell him he can come and get it, otherwise ignore that mail.
Keep the focus on you, GAL like crazy, Enjoy YOUR life.
Me 43 ring off Oct 2014 (my ring back on Feb 2015) H 51 (ring off 7/2013) M 2007 T 1996 S 14 July 2013- H told me he was unhappy.....said he is staying for Son Feb 18 2014 Found out about OW