Jim Carrey Sued By Ex-Girlfriend's Mom

Jim Carrey has been slapped with a lawsuit by the mother of his ex-girlfriend, claiming she OD'd after she realized he had given her 3 STDs and when she confronted him he dumped her.

Cathriona White's mom, Brigid Sweetman, claims in a new lawsuit ... Jim did more than just infect her. The suit alleges he shamed her by calling her a "whore" and threatened her with the help of "fixers" who tried to silence her.

Sweetman says in the suit her daughter learned from a doctor in 2013 she had contracted 2 types of herpes and chlamydia. Sweetman says Carrey was first dismissive and then claimed she contracted any disease she might have from someone else.

The mom says when her daughter persisted, Carrey ended the relationship and said, "You have become too much drama."

According to the lawsuit, the "fixers" scared her daughter into silence. The suit claims Cathriona struggled emotionally before OD'ing on Ambien, Propranolol and Percocet. The drugs were allegedly Carrey's ... the prescription filled under a pseudonym.

We reached out to Carrey's people ... so far no comment.