Drained

I don't know what it is but for about a 2 weeks now my little wonderful angel daughters have turned into demon children, I am about to lose it over here. Claire has gotten SO sassy lately, she is talking back and refusing to do things that I ask of her and then there is Paige who sees Claire acting out and is now becoming quite stubborn herself. I have been waiting for this summer to come, thinking the girls will be 4 & 2 and my life will be SO much easier, WRONG! Yes, now they are much more independent and able to do things more for themselves like I wanted, but it is back firing on me quickly. My sister's friend has 3 little girls and has already gone through what I am going through right now. She told my sister that I was not going to be liking life when they hit 4 & 2 and I thought she was crazy, how could my life be even more complicated and stressful then it was when I had to watch Paige's EVERY move. Well now I don't have to watch her every move, but more like chase after her every move. I ask her to do something or to come to me and she will look right at me, say no and take off running, to her of course it is a game. Cory came home from work today and spent a whole 2 hours with them. Once they were in bed he walked into the family room and said "well they were a pain in the ass tonight", I just looked at him and said they have been all day!
After Paige woke up from her nap, the girls and I headed to the grocery store. They are usually GREAT when we go there but today they were AWFUL. I don't know if it was just my imagination or if people were really looking at me thinking wow, that lady is losing it and those kids are terrible. I can't stand people whose kids act out in any store and here I was one of those moms. I really think it had to do with the fact that we got a cart today that has the car in front so they could both get out and go crazy. Usually I put them in the other cart where they are strapped in up front by me but today I was nice and let them get the green car, NEVER AGAIN!!
I am going to stop rambling now as I am completely exhausted from a day of now stop battles with one daughter or the other. If any of you have advice on how to get through the day without totally losing it and yelling at one child or the other, I am all ears!