Seriously Depressed while pregnant

It feels horrible not being able to be happy or feel the need to smile I am 7 months now and bc of family situations I think I’ve gotten worse I’m not excited anymore , everyone kept asking when I was going to do a baby shower but I kept postponing it so it would be too late to do one until my mother said no you should have one it’s special. This is my 4th baby 3 kids with exhusband and 1 on the way with a guy I’ve been with for 8 years now. We truly are not in a very happy place in our relationship and I can’t help but just feel sad and mad. What can help me to stop feeling this way😩😔☹️ baby is coming soon and I feel like I’m not ready and it’s not the right time. My relationship with my kids is very stressful and so is with my guy. And I don’t know where to turn or what to do. And I hate the feeling I have and hate that I will still have it when the baby is born 😓. Any suggestions??? Please