Depression 5mo PP??

I think I may be suffering from PP depression and I am no longer in contact with my OBGYN. I love my daughter, she’s my joy but something in me (I don’t know what it is) is making me depressed. I cry at random times, I start choking because I can’t breathe, my head continues to pound and my hands shake, my heart gets achy, and my mind gets weary. I started heavily crying in my sleep last night and my husband woke me up asking if I was alright and what I was dreaming of. I was dreaming of my seizure I had during delivery that I almost died from. Literally as my daughter was halfway out of me I began seizing and coded on the table. I’ve kind of blocked that out of my memory because it was very traumatic for me and then all of a sudden out of nowhere my mind wonders there.

I don’t know what to do. I’ve told my husband in a lighter way that I’m just very sad and I don’t know why. I have a lot of life situations that have hit my family all of a sudden and it’s truly taken a toll on us. I also keep having these flashbacks and PTSD from the major car accident I was in at 37weeks pregnant. I thought I had lost my little in the collision and that’s a disturbing feeling I never want to feel again. When I think of the accident I start gasping for air because it’s just suffocating.

At times I feel so hopeless because I know I should be able to snap out of this but I’m stuck right now. Am I somehow being selfish? How do I just come out and tell my husband that I think I need some type of PP help?

Does anyone have any type of advice they could give me?