No one here can reliably answer such highly specific fact-based questions without having a thorough grasp of the issues and allegations of your matter. None of your questions have "right" answers apart from the context in which these questions arise. You will need to consult with a skilled and experienced attorney who can take the time to review your documents and exhibits and to ask all of the necessary questions.
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.
To add to my colleague's response, you already have pro bono help with the free public defender, and it's unlike you can find a private criminal defense lawyer to represent you in an complicated insurance fraud case for free.
Apparently you're being prosecuted for fraud regarding your disability insurance, and I don't see what unfilled prescriptions signed by staff (which seems a highly unlikely situation, since only a licensed doctor can sign a prescription) have to do with what you've apparently been alleged to have done.
Avvo doesn't pay us for these responses, and I'm not your lawyer just because I answer this question or respond to any follow-up comments. If you want to hire me, please contact me. Otherwise, please don't expect a further response. We need an actual written agreement to form an attorney-client relationship. I'm only licensed in CA and you shouldn't rely on this answer, since each state has different laws, each situation is fact specific, and it's impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue.
Whether you find a pro-bono criminal defense attorney (doubtful) or rely on the public defender, make sure you show him or her all your information, and let them decide what they need. It is critical that you are honest with your defense attorney.