Struggling with Depression and Self-Harm

I’m in the worst depressive episode of my life. I hung out with my boyfriend last night and it ended with him having to hold both of my hands away from each other so I couldn’t harm myself. I still did it though when he was out of the room and I didn’t mean too. And today I can’t seem to get myself up. I went back to my own dorm room but I feel like I’m going to throw up constantly, enough where I thought gagging myself would help and it didn’t. I have a midterm I studied all week for that I couldn’t get myself to go take. And my sister left to get lunch with a friend we aren’t going to see until after spring break and even though I want to go so badly I can’t seem to get myself up. What do I do?