I get this problem whenever I drink something hot. I've been in cram time for the past few days and have had a lot of energy drinks and power bars. None really work. I ended up having to do a paper a few hours before it was due. I recommend not doing work in your room or dorm and trying to work in the library or some place that you're not completely comfortable in. I've also picked up on chewing mint gum and drinking tons of cold water to keep you awake.
i just drank some yesterday and my tongue feels weird
Well, probably not healthy to keep consuming it!
Really, not a good move to rely on other things to motivate you. I suggest trying to adopt a more positive outlook. The more positive you are, the more motivated and energetic you'll feel towards work.
Precisely why it's not a good move to rely on it. xD
You end up feeling frustrated when it doesn't work!
coffee makes me manic which drives everyone around me insane