Mental Exhaustion. Of this! please help!

Feel overwhelming mental exhaustion and tiredness to the point that i cant manage emotions properly and i feel like im in a dream state and have delirium. My brain barely feels like its working and its been 4 months now and if anything it's just gotten slightly worse. It originally occured when I had a night I couldn't sleep so went sleep deprived for 38 hours before actually being able to sleep. And that feeling of sleep deprivation just hasn't left me since and I've been sleeping 7-9 hours a night ever since. I've had multiple blood tests and everything has been normal amd fine. I need answers because i cant do anything like working or even just basics. I DON'T feel depressed, just so fedup of this! Please help!