Olympic Hurdler Lashinda Demus -- My Husband Strangled Me, Threatened to Kill Me

Olympic hurdler Lashinda Demus -- who won a silver medal at the 2012 Olympics -- says her husband tried to strangle her and threatened to kill her ... and she's now desperate for protection ... TMZ has learned.

Demus just got a temporary restraining order against her husband, Jamel Mayrant -- who was arrested and jailed a couple of weeks ago for domestic violence. She claims the attack left her with bruises and a lump on her head.

The restraining order also protects their twin 6-year-old boys and her parents -- because she claims he threatened all of them as well.

Demus also claims her husband is trashing her and damaging her career, saying in court docs, "I'm a professional athlete ... so I need no derogatory emails, pictures, texts, phone calls released about me on the web or to other people."