Happened to anyone else?

H

So today I was at the library with my 1.5 year old and I was slightly slow (literally split seconds )at catching up with her as she was walking off and for about 10 seconds I lost her until a stranger brought her to me. I have never felt more scared and nauseous in my whole life and now I can’t stop thinking about all the what ifs . Has this happened to anyone else ? And how did you deal with all these feelings afterwards