Just wanted to say I feel for you...I'm in almost the same boat...20 yrs...OM who is married with children. Wife always sad or angry around me.... Its like someone hands them a script and they mindlessly follow it.
I don't have much advice as my head is still spinning with my sitch, but I'm sure many others here will chime in.
One big thing is to not forget about yourself...do things you like to do without thinking its going to have any effect on her, because it won't. Just do it for you.
And don't let the crazy ones make all the decisions....have your say...don't make it easy on them if you can help it.
Stand strong, friend....its a rough ride.
Cheers
M41 W36 D19 D17 Married 20 Years Bomb Dropped Feb 14,2007...Our Anniversary and Valentines Day