Hey buddy,
Welcome to our dysfunctional family. We have other Nam vets here, so you should just fit right in.
Angry, there does not have to be a reason mate when it comes to PTSD, you can just wake up like that. It's how you manage the anger which is the key. I am by no means a master at it yet, but I and a lot of the guys on here can give you some pointers if you need. There is also ample reading material which has helped many.
Sing out if you need a hand.
Jimmy