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1. I am not aware of any law that would prevent such disclosure. It should be noted in the medical records which you can request from each doctor that treated you. Or, you may be able to get it through a freedom of information act request upon the State/DMV. Also, if there a lawsuit pending, you may be able to get this information through discovery.
2. If you have any chance of getting the testing requirement revoked, it would to sue the DMV in a declaratory judgment action and ask for a court order that says that the DMV has no right to retest you. However, given the circumstances I think the court will side with the DMV.