Do you feel like you're about to snap? Like one more minute and you're going to go completely psychotic? Like you're so depersonalized or derealized that you're going to tip off the edge of sanity and become totally and completely insane, or schizophrenic?
That's a good thing.
That's a blessing.
That indicates that everything in your brain is working; you are SELF AWARE of your mental processes, you are not going insane.
Extreme unreality feels like hell, and has even made me suicidal, but it only means that your brain is trying to save you from extreme anxiety, trauma, panic, etc. and when you realize this you can only get better. Psychotic people do not realize that they are psychotic, so feeling unreality means you are fully capable of feeling reality again. You just have to calm down and accept the feelings, realize you can only improve from here : )
"I find myself regarding existence as though from beyond the tomb, from another world; all is strange to me; I am, as it were, outside my own body and individuality; I am depersonalized, detached, cut adrift. Is this madness? No. Madness means the impossibility of recovering".
-Henri Frédéric Amiel, the first man known to have suffered from depersonalization.
Best wishes to all of you.