This article is about Federal Grand Juries. Your state laws may vary.

http://www.abanet.org/media/faqjury.html

That your case was never brought before a grand jury is simply a point of interest. Even if your case had been before a grand jury and the grand jury had refused to return an indictment (A written statement charging a party with the commission of a crime or other offense, drawn up by a prosecuting attorney and found and presented by a grand jury.), as the article points out, Double jeopardy (the jeopardy in which a defendant is placed by a second prosecution for the same offense or crime; prohibited by the U.S. Constitution) does not apply to the grand jury. So, theoretically, at some point a second grand jury could be called to consider your case.

Since the original prosecuting attorney did not even present the case to a grand jury, I would expect at the least some new, compelling evidence would be needed before a second grand jury would be called.