While a horrible/evil boss would evoke severe anxiety in most people, from what Melavai described, this current issue is not a "mean boss" issue. When we are told that something we are doing doesn't measure up, it can trigger all kinds of anxiety reactions, depending on what we've experienced in the past.
You need to find a therapist to help with this; this is the kind of problem that CBT is perfect for. Maybe talk to the person who helped you with the trauma reaction; she may or may not be able to help with this, or she can refer you.
There is a wonderful book here: http://www.amazon.com/Cognitive-Beha...5394055&sr=8-3
I use it all of the time with clients. Here's another one that I use, too:
http://www.amazon.com/Relaxation-Red...5394219&sr=8-8