Go to a lawyer and engage him or her, preferably someone who specializes in civil matters.
'Pressing charges' is a misleading term. It's really whether the police and the prosecutor will follow up on a case, and whether the victim will cooperate with the investigation and testify at any hearings or even a trial.
If the police are calling it a civil matter, then they aren't handing it over to the DA. There are no charges to press, so that leaves you with the civil matter.
As for the matter of jurisdiction, the complainant usually chooses on the basis of wherever there is possible jurisdiction + the best chances of winning the case. If the respondent disagrees, then they will move to change venue.
Time for you to get an attorney to handle this matter.