Flu like illness: This sounds like it could be the flu - and I would try to get that diagnosed 'yes or no' - as there is anti-viral treatment for the flu if that's what you have. You are certainly dehydrated (from the fever) which is adding to the headache/thirst. Your heart rate is responding to the fever and dehydration (as well as the infection!). You probably need to go to Urgent Care now. Hope you feel better.
Answered 12/7/2017
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