Is this postpartum depression or what?

My baby is almost six months old but i have a two year too, sometimes I feel so overwhelmed with them, like I lost my patience and I just want to go somewhere else and be by myself. I’m a housewife 24/7 , my husband tries to help the most as he can but sometimes I feel like it’s nothing, I feel insecure about my body and I’m afraid I’m not a good mom. What should I do?