I don't know what to say other than im sorry they disclosed what you had requested them not to.
Its not fair.
Unfortunately its done now. I hope it is being kept confidential from now on.
All you can do is be the person you always have and hope that you are judged on your merits rather than the diagnosis.
Im glad your son will be receiving the help he needs.
I don't mean to down play your upset by the way. I understand how hard it must be.