Yeah, i have. Noone really knows it, too. Back when i was a lot younger (like 13 or 14 or such) i had a huge bullying problem. Basically, at that time i never wanted to go to school again, since it was a living hell for me. It was a really bad time in my life, and yes, every once in a while, when i was depressed like hell, i seriously thought about jumping out of the window headfirst or going to the medicinal shelve and eating random stuff. And those were serious thoughts, not just "what if...". I hated my life.
But, now it's all better. Don't really understand how it happened, but i got better. I visited some doctors and stuff, but i don't think they helped much. No problems now, and feels great. But yeah, that's a part of my life i do not like looking back at. Hope you get better, too.