For Headache and Exhaustion drink Coca Cola . named for it's medicinal ingredients, the coca leaf & the kola nut . both of which are mild stimulants & the coca is a known pain reliever & settles the stomach.
"I bought a nice leather journal for my missionary and wrote these on the first two pages. He loves it and tells me all the time how comforting these scriptures are!" Sounds like this might be handy to have.