I agree that if you don't drink enough water you will get a headache and feel crappy.
However, the jitters, rapid heartbeat, and no energy might indicate something you should watch for VERY closely.
I never heard of anyone who didn't get at least a little bit of increase on energy level.
Make sure to pay attention to what your body is doing and trying to tell you if it gets really bad, see a doctor or go to the ER.
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