existential depression

I've been looking for something to explain how I feel for a while, but it wasn't until today that I actually got a name for what I'm going through. I have existential depression. 

Existential depression is basically when you believe that nothing is real and become depressed because if nothing is real then there is no meaning to life. 

One of the problems with existential depression, particularly in people of around my age is that it can cause people to feel suicidal, as there is no point to living. I've been feeling suicidal because of this. But it's only today that I've found the name for the reason. 

I just don't know what to do anymore.