I strongly suggest, since this situation concerns your professional license, that you do not post here but instead seek qualified legal counsel with respect to the underlying issues. Those are the issues that need to be addressed -- not some issue that has not presented itself.
BTW, you would have absolutely no chance of success in any civil action against a person or entity based upon their reporting of truthful information to a licensing authority or anyone else.
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I have a great deal of specific experience defending the State licenses of medical professionals and even so I am having trouble making sense of your concerns.
If you conducted yourself dishonestly in a former business relationship, allegations pertaining to such conduct can cause discipline against your State professional license. But you will be afforded an opportunity to contest that accusation in an evidentiary hearing before an Administrative Law Judge. That administrative hearing process -- and NOT a private independent aggressive pre-emptive strike lawsuit by you -- will be the process by which such accusations are heard and adjudicated.
There is little need for concern about vulnerability for your license for any allegations arising from a prior business relationship other than allegations of dishonest behavior. CA State licensing agencies will not ordinarily act against a professional license based on civil disputes or business issues not involving issues of dishonest or unethical conduct, or conduct in violation of State law.
You cannot sue for the act of making a complaint to a State licensing agency. Such complaints are privileged -- for obvious reasons -- even if the allegations in the complaint are ultimately found not sustained or untrue.
My responses to questions on Avvo are never intended as legal advice and must not be relied upon as legal advice. I give legal advice only in the course of an attorney-client relationship. Exchange of information through Avvo's Questions forum does not establish an attorney-client relationship with me. That relationship is established only by individual consultation and execution of a written agreement for legal services.