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Diddy is facing a stunning lawsuit ahead of his sentencing ... the mogul's long-time stylist Deonte Nash is suing him for sexual battery, human trafficking and more.

According to new court docs -- obtained by TMZ -- lawyers for Deonte claim Diddy turned his dream of becoming a celebrity stylist into a "nightmare" ... one he was "forced to endure nearly every single day" during the roughly 10 years he worked for Diddy.

The docs go on to say ... "The horrors Mr. Nash experienced continue to plague him even after his employment ended." Getty

Deonte's legal team claims Diddy -- through his employment -- subjected him to "a decade of sexual and physical assault, sexual and verbal harassment, trafficking, degradation and humiliation, threats to his life and well-being, sta

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