Allergic reaction!?! After birth

I have been experiencing these hives for a while and I don’t know what to do, this time it got so bad it was hard to breathe and my throat was closing up, I’m scared it will get worse I don’t know what I’m allergic to I didn’t eat anything new I did just have a baby through csection a month ago and that’s when this all started, could it be related to giving birth also I did not scratch my neck I don’t know what to do