This may be too simplistic (and I'm not a mom) but I think you need a day to yourself. Arrange for a relative or friend to take the kids for the entire day or even overnight. Grab a friend and do something you love. Doesn't have to be expensive, could be renting a movie, sitting back and reminiscing over the old days. Go to the beach if you like and feel the calming effect of the water rushing ashore. Grab a hot dog or pretezel. Something you loved to do and haven't done in ages. Sometimes local stage shows are just as enjoyable as broadway. You get the picture. It will give you a lift that the things you loved to do are still in your grasp (just not as easily organized anymore). You need to know you can still feel that happiness again and YOU CAN!! Plan for it and it will happen.