I'm sorry you are having such a rough time. I was bullied (slightly different I know) in middle school and high school and it left psychological scares. I also had the experience you describe at a job that I held for 6 years. It was pure ****. Despite the great salary and benefits it was starting to impact my sanity and I left. Do you think this instigator might be jealous or intimated by you? Keep your head up and shake the dust off. They are not worth your time. You could see a therapist to help you process what you're feeling. Hugs coming your way.