Don't rule out West Nile virus from mosquito. Not that it's what it is, but a blood test could confirm it if that's what it might be.

a buddy of mine had flu-like symptoms; loss of appetite, fever/sweating profusely/chills, weak. His doctor suspects West Nile, so he took a blood sample for testing..

I would get jittery feeling after giving blood so I quit.

Syphoning off blood from your system by donating is good for your health, in that some impurities cannot be filtered out by your body, so your body then needs to make more fresh.

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'06 E320 CDI
'17 Corvette Stingray Vert