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Megan Thee Stallion took the stand Thursday in her defamation case against blogger Milagro "Gramz" Cooper ... and broke down crying while talking about a PSA she once did for suicide prevention!!!

The superstar rapper was being questioned on the stand about the night of the Tory Lanez shooting, when she was shown a bit from a documentary she did with mental health nonprofit org, Never A Bother . Play video content

Megan tearfully told jurors she knows what it feels like to "not want to live anymore" and went into detail about the toll the ordeal with Tory and Milagro has taken on her.

Megan also told jurors about battling rumors -- including the one that she was sleeping with her manager, Travis Farris -- and feeling tremendous anxiety as a

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