Does social anxiety cause irritability ...and can you be hospitalised for it?

I was diagnosed with it but is it that serious where a person can be hospitalised? It's seen as a mental illness, sadly but I don't see it as such as it's hard for me to accept. Since lately, I've been overwhelmed and avoiding people as I'm trying to focus and get myself together in life. I lashed out, non physically recently after feeling caved in by my personal issues.