One thing I've done to help alleviate some of my stress is reinstate rest time for the older kids. I used to let them play quietly, but it always ended up not being quiet and me constantly harping on them that they were being too loud. So now for the first hour, they have to laydown with a book and be quiet/rest. It's helping a bit which is good, gives me a much needed break midday.

Thanks for the feedback, I like the idea of putting a bunch of the toys away and only bringing out one at a time. I'm thinking I need to term some too, but I don't know how to go about it, I've never termed anyone before, I've always just sucked it up and waited until they moved on.