Chapter 14 in Derek Prince's They Shall Expel Demons shares a testimony of deliverance from hallucinations www.derekprince.com
Secrets of the Dead PBS television case file The Witches Curse  VHS format item # SEDE921 
Excellent case study on the ergot fungus that may have caused psychosis and death in many towns.  Many victims may have been burned at the stake as witches.  Ergot is a fungus found on rye grain, especially during damp weather.  Bread made from this grain may have been contaminated with ergot.