Hello,
Which came first?
Did you just not get any sleep one night and then drink a lot of coffee to help you stay awake the next day, or did you drink a lot of coffee one day and not get any sleep because of the caffeine?
If suddenly you're drinking 5 to 8 cups of coffee after not drinking it for two years, you may be feeling a more intense caffeine rush than you've ever experienced. Since it's only been a couple of days, just stop drinking the coffee, and when you're body is tired enough it will let you know when it's time to go take a nap.
You wrote that you feel "really sick and heavy breathing and heavy vision...and feel dead inside" I'm not totally sure what it is that you're describing, but if you keep feeling like that, please go see a doctor and tell him or her what's going on with you. There may be something else happening with you that only a doctor can see.
Rose