Around two summers ago on a hot, sunny day, I had just finished mowing the enormous lawn, weeded the gardens, and swept the driveway when this happened to me:

Muscle weakness
High fever
Headache
The fever would go away, but come back every day for about three days.

I'm curious to know what I actually had. Was it heat exhaustion?

yeah happened to me i mowed a huge lawn that had not beed mowed in forever the grass was high i the stupid push mower kept stalling out my mower blew so i had to get the neighbors i came home that day to get the same problems you had high fever hedache and weak uscles it heat exhaustion take a shower and youll feell better but not a cold one because your body cant handle cold after being in the sun u could get a heart attack so a nice warm shower makes me feel better