I'm not okay. PPD?

I gotta be perfectly honest here since I have literally no one to talk to. I'm a young mother of two. I'm 20 years old with a 2 and 1/2 yr old and an almost 4 month old. Both kids have different fathers, BD #1 isn't in the picture and hasnt been since my son was 4 months old so I have sole custody. BD#2 is trying to take custody of my daughter from me. He kicked me and my son out on our asses for me "smoking pot" which i wasnt doing because I was nursing my daughter. I'm now completely homeless and have been for about a month I'm currently looking for homeless shelters but have had zero luck so far. I get my daughter Saturday into Sunday and I'm supposed to get her Monday and Tuesday day while her father is at work. I actually had to go and file him for contempt of court because he isnt allowing me to take her while he works. I'm trying SO hard to get out of this ru but I feel like every time I take 1 step forward i immediately take 100000 steps back. I'm calling tomorrow to try and get into therapy because I am genuinely ready to take my own life at this point. I've been homeless on and off since I was 16 years old. 4 fucking years I've been homeless and I just want to get my life on track and get my daughter back. Her father is Not civil with me at all. I cannot even have a conversation with him about our daughter without him swearing at me and saying awful things. I'm not a bad mother, I do everything in my power for my children but he just doesn't care. He lets his mother pull his puppet strings and does whatever she wants and whatever he says at any given moment. I just want my baby back. I was forced to stop nursing her when i wasn't ready too. I'm trying so hard to stay strong but all i want to do is fucking kill myself