The doctor can say whatever he or she would like to you personally, they have the right to free speech after all. As far as releasing this information, the HIPAA forbids a doctor from releasing your test results to anyone without your consent. So if you want to keep your test results to yourself, that is up to you, so long as you did not already sign a release for them.
The only exception to this I know of is if you hurt yourself on a job, and the employer requested it. To the best of my knowledge this only applies if you signed a release when you took the job for just such an occasion. Employers don’t like to lose money because you were under the influence in the workplace and hurt yourself.