Yes, I've been in a workplace traumatic situation that had consequences. I fully understand how difficult it can be.
You've done quite well surviving the changes. The alternative of Workcover is a last resort, I'm very knowledgeable in that field both as a claimant and employee. The system is far worse than working in a toxic workplace.
I would take evasive measures in this period mainly to repair yourself at all costs eg holidays, work without pay, sick leave- whatever you can muster.
I have written a thread on surviving the workplace. Use google-
beyondblue Topic fortress of survival (workplace)
Beyondblue Topic anxiety, how I eliminated it
Beyondblue Topic they just wont understand, why?
I hope they help. Repost anytime