I can't say that I know what it's like to have in-laws, but I do know what it's like to have parents and the way my parents react to their parents. It's too bad that there are some relationships based on guilt and manipulation, but sadly it's frequently the case with parents and their kids. I've only met one couple (my maternal grandparents) who don't do any of that. I love them so much. They are always kind and accepting of people's weaknesses provided the person isn't using them (over and over...which some try to in my extended family, but they don't put up with after a pattern has emerged). They love me just the way I am. I hate California, but if I ever had to live there again, I'd rather be near them than anyone else, and this is the blanking most boring and hot place in the state in my opinion. It's also probably the meth capital of the state. Bleck. I don't have drug problems, it's just I know personally what addicts are like when they're using. Not that they might not be good people once they get off of the drugs, but in the mean time, I hope they stay far away!
Anyway, I'm rambling. Sorry the in-laws ruined your plans. Your husband does need to learn boundaries and say things like, "Hey listen, we'll be by sometime soon. We've got to get the frozen items home and have plans that need daylight. Love you. Bye."
It's a friggin' dog toy. They shouldn't run your life, but you already know that. How frustrating.

Hope you get some time to relax by yourself soon.
I know I'm getting a bit stir crazy when I get upset that my mate comes in while I'm doing a chore in the other room and asks me anything. It's like, "Go away! Can't you see that I wanted to be alone? Why did I close the door?" But I don't say that. And I'm trying not to snap when he asks me how I feel or what I'm doing or anything. WTF is wrong with me?

See, even nice people can trigger me, how much more so ones that are obviously manipulating you?