I spend a year after my third child was born with what I now know was PPD. I even went to the dr but got no treatment or diagnosis.
I felt like I was dragging myself through wet concrete every day just to get the basic things done. My kids were 4 and 2 when the youngest was born. She was born with a congenital cataract in her right eye. It's was a very stressful time.
There is a saying " I would have a mental breakdown but I don't have time" that's what I remember of that time, I just keep doing because the kids needed me to. I don't know how I got through and came out the other side with a marriage and three kids intact.
I hope you can get the treatment you need to help get yourself through this, you have had it very rough with a traumatic delivery and issues with the health of your little one.
Try not to despair there is light at the end of the tunnel.