I wouldn't normally respond to a question that has already been answered by two experts, but am doing so to point out that Samuel's original response gave you exactly what you asked for ... a statement of the recourse available to you under the circumstances you described.
At some point down the road, you might need more specific advice, such as how to file for a restraining order or how to file criminal charges. However, until you take the initial step of putting this person on notice, the rest of it won't mean much. And, if the suggested letter stops the contact, you won't need the rest.
Contrary to the impression you apparently have received from being a law student, being an lawyer often involves giving practical advice that isn't necessarily based upon a specific rule of law. That doesn't make it b.s., something you will perhaps understand better once you have finished law school, passed the bar exam and achieved some real world attorney experience.
I too am "really a lawyer". You can find my bona fides on the California State Bar website at:http://members.calbar.ca.gov/search/member_detail.aspx?x=67254
I will post this as "need info" rather than as an "answer", but you should accept Samuel's original answer, as it was a sound and complete answer to your question.