I know you were journalling, but a few things you said match my sitch exactly, so I felt I should comment.
We all have rough days. You'll be fine and you'll survive - you've come a long way already. And you're not alone in feeling resentment at being burdened with keeping the family going while your H is off doing whatever he wants to with no responsibilities.
I completely get what you're saying about feeling like your being burdened. Being a single mom isn't easy (and for now that is what we both are), especially when it's a role you've not chosen but rather had thrust upon you. It's a little bit easier for me as my son is old enough to leave home alone if I wanted to go out for a while, although it doesn't happen very often - and I wouldn't have to do that as my dad lives with us. Working full-time, then coming home to what is essentially a second full-time job can really take it out of you. And you're still getting into the routine of being at work full-time. It'll get easier.
I started by setting up a new routine where I only do laundry on Wednesday evening and Saturday morning, I do any housework either Saturday morning while the laundry is doing or one (two maximum) evenings and only in the evenings if I absolutely have to. Yes, my house might be a wee bit messier than it used to be (actually I'd prefer to say more "lived in", than messy) , but spending time on me and/or quality time with my son are more important than living in a show home. I've also managed to get my son involved with helping around the house, and my dad also helps out with the dishes and yard tasks.
Stay strong and keep up the good work you've been doing.
Both 50 S14 M 16 yrs (his 3rd; my 1st)
ILYBINILWY - 24 Dec 2012 H moved out - 27 Jun 2013 Legally separated - 6 Sep 2013 Closing the door and changing the locks