I know how you feel! I am functioning as a SAHM now because I lost my job. I work way harder now than when I was working! Seriously. All I want to do the moment my husband comes home is to run away and be by MYSELF. My kids are demanding but I know they are just being kids. However-it is HARD being home all day and honestly not always so rewarding.
You should pat yourself on the back though. I have seen the projects you do with your girls that you posted on facebook and I can tell how hard you work at being a good mom!
I think times are tough for those who are working right now though. I'm sure your husband doesn't mean to hurt you but nevertheless it is so frustrating when the kids are just on top of you all day. I know how that feels!