I'm not sure what to do right now. Anybody want to help me out?

About two weeks geleden my depression returned to me and I'm not sure why. I've also been experiencing some rather intense physical pain all over my body and I can not sleep. I can't sleep due to a mix of the pain and the fact that I can't seem to stop thinking about my own death. I just keep replaying all the details like it's something to really look vooruit, voorwaarts to.
I tried to stab myself in the stomach but something about the way the mes hit my stomach didn't feel right.
I don't know what I'm supposed to do. I know the pain is all in my head but I need it to stop. I feel as if something inside of me is trying to claw its way out of my skin; trying to free its self.
What should I do? I've got school in just a few hours.