Stanley I have no experience in this area however what you're experiencing sounds quite scary. (Just in time for Halloween!)

In all seriousness do you have any other means for financial support? -family that could help pay for some type of exercisum sp.?

I have a friend who's friends with the woman who went to the amittyville sp? house. Her and her husband are known across the world in this type of work (paranormal). Her husband has passed but perhaps you could contact her and see what suggestions she has? Also have you tried getting holly water on your own and using it?

I would think there is someone out there willing to take on a case pro bono.

Not sure where you live but the paranormal person that's famous lives in CT/New England.