I don't know what's going on.

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I sleep, sometimes for 4 hours, sometimes for 12. Yet I never feel rested. It doesn't matter what I eat or drink or when I sleep or get up. I never feel good.And a lot of the time I wake up in the middle of the night with cold sweat and a sense of fear, I even forget who I am and where I am for a good 5-10 minutes.I don't recall any nightmares. Am I dying or something >.>

You're not dying, but those night episodes sound rather like adult night terrors. Are you under a lot of stress? Are you eating properly?

I eat alright, but I'm always stressed

That Wikipedia article suggests some treatments.Constant stress is bound to cause problems eventually. Even when you think you are coping, it's eating away at you. Often you can't do a lot about your environment, but treating your mental attitude to your environment is still helpful.