Help.

I am 3 weeks & 6 days postpartum. I've been very overwhelmed, no sleep, no eating , feeling neglected, overly emotional in which I cry constantly sometimes for no reason. I am very very overprotective with my daughter to the point where I get angry if certain people come too close to her or touch her. I get very offended when people tell me I'm not doing something "correct" when it comes to my baby and haven't been taking criticism so great. Any other moms that are going through a rough time during postpartum? How are you holding up and dealing with it all? Any tips? I feel like I'm losing it and feel helpless especially since her father isn't around much constantly working so we don't see him much.