just then i tried eating raw coffee beans so that the terrible taste would keep me up, even that didnt work
Raw coffee beans? Gross haha.
I take heaps of vitamin C everyday... helps get rid of any colds coming on also... don't know if it helps with tiredness though.

Maybe you just need a break? As in, take a whole day off and don't do homework but just chill instead. I know it probably isn't best study-wise, but you'll find you have more energy and motivation if you just don't look at the books for a while. Tiredness doesn't just come from lack of sleep, it can come from stress also.
At the end of the day, your health is more important than VCE so maybe just take it a bit easier.