I feel like I'm going insane

Please read this and give me your views, I understand that no one is a doctor but your views would be amazing. Basically Im 18 years old and I've had anxiety since I was really young, probably since the age of 8 and I was diagnosed with depression recently, although have suffered from it since I was around 13. I'm beginning to wonder whether its something more deeper that that, I cant take even the slightest bit of negativity - it sends me insane to the point where my thoughts are racing, thinking about death and I'm sat pulling my hair out in some kind of day dream. Another thing I've noticed recently is at night when I'm trying to sleep and I close my eyes, I began getting like this weird out of body experience that I cant explain I just dont feel normal, its like in my brain I can see myself screaming and I can almost hear it. This sounds ridicilous and me typing it doesnt really do it justice. I feel as if the whole world is against me and that I dont get enough appreciation as I should, and I cant control my emotions in any way at all. its like my heart is constantly pounding out of my chest and I'm always on edge.. please help