I can see where your concerns would be fully justified and action is definately necessary. You should make an example of the guilty party.
In further note to your post, no, in fact, it is not Oz who is guilty of posting personal information. He made an accusation and you have in turn confirmed it in your post, thereby, making yourself the responsible party (Until you verified it as fact it was just heresay). As you are in fact an individual who does have direct and intimate knowledge of above stated ailments you do have the direct responsibility to ensure that knowledge of your condition(s) is kept private and only passed to parties with a direct interest/activity in the treatment of said condition(s). In the fact that you failed to uphold your confidentiality you do have the avenue of litigation against yourself for releasing it to the public, if in fact, you, the offending party, did knowingly and willingly, release this information without your, the offended party and clearly a victim in this case, express written consent. This is a matter that you will have to determine prior to bringing legal due to the fact that if you do in fact have written consent to release your condition to the public and you brought suit you could then, in turn, counter for defamation of character, wrongful suit and damages.
If I were you and you were me, I would sue me and go the next step of kicking myself in the cajones for being so arrogant, tasteless, callous and stupid. You would probably be sitting here thinking just how dang stupid I was for posting medical information in full knowledge of it's factual content and sensitive nature. I'm not and neither are you and boy am I glad, I'd hate to be in your shoes and I would definately hate to be as stupid as you have got to be for having done it in the first place. Especially with all the rage about HIPPA in the halls of IT right now.
The only thing that Oz would in fact be in guilt of is voicing a personal opinion with some rather crude comments directed toward you. You could maybe try to get him for exposing how much of an idiot you really are but then again, the judge might agree with that an in turn make you a precedent by actually convicting you of being stupid.
Here's your sign by the way.......