What Is The Cause Of Tiredness And Loss Of Emotions?

Please help me. I have developed a problem that seems to surface in my brain. Whenever it gets late, not even really late just a little late I start getting really out of it my face seems to change even a little bit. And I feel this overall extremely weird terrible feeling and I can barely feel my face and not connected to my body. I get this look in my eyes like this soulless look, it's really scary I feel like i have brain cancer something. when I feel like that's I can't feel any emotion I know I need to sleep but I can't feel tired I can't feel anything. If I'm not able to sleep good that night and the whole next day I can barely function I look completely terrible, like I'm completely not even there. Somehow I force myself to get through my day which I barely can make, I get extremely sick. I was never like this before but it's to the point where I'm actually suicidal. Does anyone of any idea what this could be? Will provide more answers to questions if needed. Btw it makes it extremely hard to think all the time too, and I was always an extremely intelligent person, now I feel like I'm not even really here..