Yes, holidays really stretch our emotional limits. Sometimes we put So.Much.Weight onto these days...
You've had a tough few days. I'm so sorry for that exchange with your mom.
I have to second rppfl's thought about asking for help. My mom is a notorious martyr-- never asks for help, but then expects everyone to magically know what she needs help with, and then gets so passive aggressive when my dad doesn't help.
Some people are really good at jumping in to help; I'm not, but I've learned to at least ask to help. But I'll be honest about myself-- sometimes I feel like I'm all thumbs when I try to help in someone else's house. I've dropped food on people while trying to help serve... I've dropped dishes while trying to help clear the table... I've messed up in other ways! I'm always embarrassed by that and therefore sometimes hesitant to offer to help.
Not sure if there will be opportunities with your H, but certainly opportunities to teach your kids, if they don't yet have those habits, and most likely there will be opportunities in your next R, whoever that will be with, to be more assertive in this area. What do you think?