The DA has charging immunity which means you can't force to prosecute a case he doesn't wish to prosecute. In any event it is now too late as you have missed the many filing deadlines that apply in suits against government entities.
Find a private attorney and sue your attacker.
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You cannot sue prosecutors under the sort of circumstances you have outlined.
In no way am I offering you legal advice, and in no way has my comment created an attorney-client relationship. You are not to rely upon my note above in any way, but insted need to sit down with counsel and share all relevant facts before receiving fully-informed legal advice. If you want to be completely sure of your rights, you must sit down with an experienced criminal defense attorney to be fully aware of your rights.