Pete Davidson says a gut-wrenching call from his mother helped him commit to getting sober ... 'cause he was heartbroken after hearing his mother say she worried she'd have to live through his death.

The comedian and actor dove into the difficult conversation on Theo Von 's 'This Past Weekend' podcast ... telling the host his mom, Amy Waters , got real with him while he was in rehab. Getty

Davidson says Amy -- who he calls "the most supportive person in the world" -- told him she was terrified of turning on the TV one day and learning her son died because of his addictions.

Pete said, "That killed me, so I was like, ‘Alright, can’t die until she’s dead.’” Gallery Launch Gallery Getty

Of course, Pete also thought about his father, Scott -- a New York City firefighter w

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