That's a very sad situation mate - isn't it strange how an accident can cause these mental health problems? One thing which is good, (actually 2 things) - your son is safe, and you're still here.
Does it affect you in any other way apart from this depersonalisation? I've heard of that but I don't think I understand it.
I think my anxiety started when I was about 15 or 16 - but it wasn't so bad that I couldn't function. And it wasn't like a lot of the young guys on here - I still could have normal relationships etc and I could go to work.
It's become much worse now I'm older though - I don't know if the antidepressants they gave me about 12 years ago started it or whether it was there all along - but I certainly have a serious problem now with the bipolar. It makes me very unstable and it's difficult to deal with.
Edit: the situation with my mental health got worse, not the anxiety)