BUT, and this is the thing to remember, a bad day does not the whole thing make. Yes, go dark - for YOU as much as anyone. Maybe try to find some middle ground to talk to the boys; explain (again?) your need for them to help, etc. But one day isn't going to make or break what happens otherwise - especially in the overall scheme of things.
I had a few friends tell me how much I needed some time away alone, and I did take it. I don't know if it had a long lasting effect, but it gave me a break. Even if it feels like putting yourself outside the group, could you tell DH you need him to take the boys when he goes to the beach, and you then have some time alone (or with GFs?)? Since you have taken the time off already, maybe give yourself a place to go - even for a night or two - to regain your strength. Just all things to think about for you to do for you.
And one more thing to do just for you: contact your IC. You need someone who can be right there to help you keep your perspective in the midst. You are doing ok, but your frustration punishes you more than anyone else and an IC is the perfect outlet. I know a huge part of my own progress right now is the work I'm doig with my IC for me; I'm able to take that hour to talk about things that are MY issue and that helps so much in the midst of what feels like everyone else's spotlight.
You are a good person dealing with the crappy transitions; give yourself a hug and know you are thought of tonight.
(Oh, and the colonoscopy went ok; I am losing weight and have a messed up GI system only due to stress... )
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