PTSD from NICU

Did anyone have to spend time in the NICU after birth? We spent 2 nights with our baby for suspected heart issues leading to rapid breathing after birth. Thankfully everything was ok and we were discharged. Now every time I close my eyes I see him with the tubes hooked up to him and want to cry. I also cried the other day when an ambulance passed me (he had to be transferred by ambulance). He is 4 weeks old. I thought this would go away by now but any time I think about it I become sad and want to cry again. I’m also constantly obsessing about his breathing now. He wears an owlet at night just so I can get some rest.

You would think that I’d be happy that everything is ok but it seems like the opposite. Does this get better?