Just not happy!

I just want to ask other moms on how they are emotionally and physically after having baby. First off, Im a stay at home mom, and this is baby #4 for me. my Other 3 are school age, and attend school Monday thru friday. After having baby girl, I physically and mentally felt great. ALittle tired, but thats normal. Now almost 9 weeks later, im not happy anymore. I dont feel happy, I dont feel pretty, I still have 20lbs to lose to get back to my prepregnancy weight. While the older kids are at school, i am pretty much just sitting all day long. Either breastfeeding baby girl, letting her use me as a pacifier, or holding her. Along with trying to get a little housework done, and cooking supper before my husband gets home. I truely have no energy. Then when my older 3 get off tbe bus, its more sitting for homework time. I dont know if its depression setting in, a hormonal imbalance, or what. I get upset for everything. When my pre pregnancy jeans and tees dont fit, when my older kids make a mess, when they run in the house or break something, or when my husband doesnt hear me the first time and i keep repeating myself. I dont want to be touched, loved on, im snapping at and pushing my older kids and husband aside to tend to baby more, and then to top that off, theres ZERO alone time or intimacy between my husband and I. Is anyone else feeling this way, or have delt with this before? I just want a happy pill, or my hormones to level out