I can relate to what you are saying. The LBS is on their own to get through these tough situations, while WAS is off enjoying themselves, free of responsibility. It's totally not fair that they get to just leave.
Once when I was sick, I asked my WAH if he could come over and watch the kids. He said he was "busy". But if he's sick on days he has the kids, he quickly brings them back to me.
I'm so sorry you are feeling down. I hope you start to feel better soon.
M:35 H:36 Married: 14yrs Kids: D7, S4, D1.5 BD: 4/14 Mentioned Divorce: 5/14 Moved out 6/14 OW confirmed: 9/14 Wants to move forward with D 11/14