You better get a really really really really good lawyer and get that dismissed and expunged.
A domestic violence conviction is at par with a felony. It will screw you for the rest of your life. Do all that you can to avoid conviction (taking a deal is a conviction on record that you will need to explain.)
An arrest by itself will not hinder you as much, and not at all in the private sector most likely. Arrests need not be disclosed in most cases. Worst case is you move somewhere that employers cannot ask. The NREMT only asks about felony or domestic violence convictions, period. Don't ask, don't tell.
Fact is, unless convicted of something, you are innocent in the eyes of the law.
Multiple arrests, sans convictions, will hinder you for character flaw and poor judgment and suitability. That is not a legal standing, but rather from a hiring/licensing perspective. Even if you don't tell, and they don't ask- someone with multiple arrests is likely a ****bird that will weed theirself out in a real profession.
However, if you plan on applying for any government jobs that require extensive background checks such as firefighting or federal government then you are required to disclose arrests- and DV is a likely disqual.
Sorry bud.
Edit to add: I am not a lawyer; as per my opening statement- get one.