I caught my roommate (opposite gender) wearing my clothes and using my vibrator! What do I do?

I don't even know where to begin with this. I am a 23 year old female college student and finals are this week. My 31 year old male roommate thought finals were last week. He thought I had left home for the holidays Friday afternoon. I was actually out with friends. When I came home and went into my room I found him in my bed wearing my garter belt and stockings with my vibrator inserted in his rectum and a ball gag in his mouth. I immediately told him to get out of my room and have not talked to him since. It has been 3 nights now, what should I do? I don't want to go home for the holidays and have him here going though my things. I threw the vibrator and ball gag out and it grosses me out to think he may have done this before. He has not returned my garter belt or stockings and I dont want him to. What do I do?