I'm not a lawyer, so this isn't legal advice. But at this point, you probably can't claim any damage since you haven't been damaged. Damage might involve having to sell your unit at a lower price than comparable units because of the actions of the agent. But there might be other areas you could pursue legally. Again, check with a lawyer.
Hope that helps.
Not to demonize the victim here, but have you considered that, perhaps, looking for damages where there aren't any is also bad behavior?
Certainly, you do not have a professional responsibility to the public. But you're either damaged or your not, and your neighbors who are on the market are either damaged or not, and it's not really up to a bunch of strangers to provide that evidence.
It's enough that the agent is in violation, but again - if you have real damages, then - and only then - should you consider your options. Otherwise, just report them.
Your realtor may not do this for a bad intention. I am sure, he/she is trying to help in all ways to help you get a qualified tenant. Ask him/her why he did that. And tell him/her you would not allow this happen again.
You have three places you can contact regarding this realtor's behavior. The state department that issues real estate licenses, the Board of Realtors in your area and the manager of the company the realtor works for. You'd have to ask an attorney about the question of damages.
Regarding the actions of your former agent...call her/his manager. If no satisfaction, call the local Board and see how to file a complaint.