My brother had an incident of paranoia after heavy drinking, like a mental melt down. He left my sisters place in an agitated, fearful state and drove for 40 km before I could talk him into stopping. He thought "they" ( my sister - conspiring) were out to get him somehow. I had to tell him that "they" were only looking for a car that was driving and would not find him if he stopped the car, which he did- but he was totally paranoid. He is a daily drinker ( 20+ years) but would / could this be just the alcohol or something else ie: nothing to do with alcohol. Now sober and discussing it with him he still seems to think their is something going on.