Scott Stapp -- Placed on Psych Hold ... Fears ISIS Attack Against His Kid

Creed frontman Scott Stapp was placed on a psych hold after cops say he had drug-fueled paranoid delusions he's a marked man, and his wife says he hears voices and worries his kid will get attacked by ISIS.

TMZ has obtained a Madison County Florida Sheriff's Dept. report which says deputies found Scott on the side of a road Nov. 13 and he appeared wasted, incoherent and rambling that someone was trying to poison him. Cops placed him on a 72-hour psych hold.

Jaclyn Stapp -- who filed for divorce last month -- then filed new legal docs claiming Scott is off the hinges, threatening to kill himself and his AA sponsor, and she says he has the wherewithal to do it ... he has guns.

According to the police report ... Jaclyn said Scott hears phantom voices and has visions of people on fire. She says he's also paranoid. He left a message with the dean of his kid's school on November 10, warning that the school was about to become the target of an ISIS attack.

As for why he's out of his head, Jaclyn says he's on a potentially fatal drug binge, fueled by steroids, weed, cocaine, PCP, Special K, Crystal meth, and various Rx drugs.

Stapp posted a desperate video Friday, saying he's broke, sometimes homeless and sometimes goes without food. Jaclyn says it's because he blows all of his money on drugs, and has resorted to pawning personal items to fuel his habit.

Jaclyn dismissed her petition Friday to lock Scott up ... we're told she's now talking to Scott and hopes she can accomplish her goal by communicating with him and convincing him he needs help.