A few  things I've found that work for me.
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Walking away. Â Just realizing that whatever it is... it's not worth my losing my cool over.
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I keep a package of European-style cookies that I love (LU) in the cupboard. Â I'll make a cup of mint tea...take 2-3 cookies... go to my room and escape for 15 minutes. Â Sometimes, I'll even turn on the TV for the kids to lengthen my time of peace. Â If I'm really frazzled, I'll even put on TV shows that we don't regularly watch. Â IMHO, the break and peace is worth the quesitionable material on occasion. Â
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Taking a shower.... or shoving all of the kids into a bubble bath (well, not the baby).
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Surprisingly, letting my kids know that Mom is having a tough day. Â I used to be a massage therapist...and probably because of that, our entire family massages each other. Â So if I say that, the kids will climb up on the back of the couch, and massage my back.
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Family sandwich. Â I lie on the floor...I'm the bread...then my eldest gets on and decides what he is (peanut butter)....then my middle son (jelly)...then my daughter (bread on top).
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Try to get them to be silly (or do this myself.) Â We were having an issue with DS1's anger. Â He would get really angry at everybody--and couldn't calm down. Â So if he said something really loud and mad... we'd then ask him to say it in a grumpy voice... then in a baby voice... then like Foghorn Leghorn.... then like xyz. Â Â
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Onetime when I was pregnant with DS3, I remember just walking outside the door and closing it and breathing in the nice fresh air. Â That was wonderful.