Paris Jackson revealed she underwent “painful” ECT (electroconvulsive therapy) while battling depression — but insists it wasn’t a “barbaric” experience. The 28-year-old explained on Monday’s episode of Jay Shetty’s “On Purpose” podcast that her “Happiest Day of My Life” album cover was inspired by her real-world treatment. In the photo, a hand holds Jackson’s chin as she stares straight into the camera with a bite guard in her mouth. “I did nine sessions in three weeks,” the singer said of “getting electrocuted” after being “very, very close” to attempting suicide. “[I was], like, centimeters away,” Michael Jackson’s daughter, who made…