Rant?!Advice?

So my relationship with my kids dad isn't too good never really was from the beginning but we stayed together for about 3 years. He recently came back to us after 7 months of being apart.. During that time we had no contact and he never tried to contact our oldest son and he knew I was pregnant with our second. I recently just had our baby 3/31/22 and our oldest is 2 both boys. Since we been back together things have been going good until a couple days ago we got into an argument which led to us fighting. I'm suffering from postpartum depression really bad but am trying to hide it. I feel so alone and just like an overall shitty parent. I had an emergency c-section because of a cord prolapse. Felt soo defeated and unworthy of having my newborn and like I shouldn't have made it through the surgery and I haven't said much about how I feel about the whole thing to anyone. Their dad wasn't helping me with the kids or anything financially like I thought he would. My moms been helping me with our 2 year old watching him during the day. So we got chick's for Easter and my son likes to play with them and feed them. I'm okay with it as long as he's being supervised. So his dad takes them out of the box and says I'm going outside to sit in the car I'm already annoyed and dont wanna bother asking for help because he should know I need help with the kids. He hasn't helped with the kids for awhile just sleeps and plays his phone all the time. He dont help with the baby at night either. So I am tired and irritated and sensitive. I had to get mad at my son because his dad let him play with the chick's and they were pooping on the bed and The baby's crying and my 2 yo is throwing the chick's around and I'm just overwhelmed and react in a negative way by yelling at my 2 yo and crying with him because I know I was wrong for that. And I just text their dad who is outside playing games to just go home because he's not helping me with the kids the least he could do was help me out a bit. He comes back in and starts saying stuff towards me not being able to handle them both and about how I'm not breastfeeding the baby just formula feeding. And just unnecessary bullshit. Anyway he went home hasn't checked on the kids for a couple days or anything. Anyways I know I was wrong for saying that and not asking for help. I know the kids miss their dad so I'm thinking of just co parenting I'm thinking I drop them off to be with him and he can drop them back off at the end of the day? Or I could keep the baby then he can get our oldest then switch the next day to make it less stressful for him? I haven't talked to him about it yet but is that reasonable/fair? I don't know if he will even want to coparent with me but if he's willing to I hope we can come to some sort of agreement 😤😣