To the writer:
im not sure this is the right venue to discuss the issue you are describing. That said, please consider the following:
1) Utilize a community mediator. This is a very tense situation that could escalate rapidly without support.
2) Write and call your local government representative.
3) Recognize that the neighbor's behavior is not about you. This conflict has brought up an "old" story for you and for your neighbor.
4) Engage with your own therapist/ counselor to work on the fear, rage, and helplessness you are feeling so strongly. You may need to acquire some skills to regulate your own feelings before you can productively address the issue with your neighbor.
5) Consider your safety before attempting contact with this neighbor. Consider avoiding engaging directly with your neighbor. Utilize another route, mode of transportation, dog park, etc. as much as possible. Continue to utilize community supports, as needed. Keep a diary of what has been tried and what continues to happen.
Peace.
Krys