My daughter just got out of the hospital and now i can’t function. please help

My 5 month old was admitted to the Hospital on Friday for pneumonia in both lungs and HMPV virus. Her oxygen was really low and she wasn’t eating. She started eating once she got the oxygen and was able to breath on her own again today. She was discharged about an hour ago and we just got home. I am here because since we got home I have had the worst anxiety I have ever had in my life. I feel like I can’t even function. I don’t want to eat or sleep or do ANYTHING at all. I feel like I don’t even want to exist right now. I want to cry and scream but at the same time I feel emotionless. There is an awful pit in my stomach and I feel like I am going to throw up. The worst part is I don’t know why I feel like this or how to make it go away. I am hoping someone else in this group has went through something similar and can please help me. I don’t know if this is a form of PTSD or what.