it ain't test flu, it's a reaction of your body to some substance, either oil, or high hormone concentration or solvent or whatever.I probably do...I’ve not had test flu before, or whatever this is, but it just hit me like a ton of bricks and 8 feel like complete shit...damnit...I hope this goes away soon
OR, it could be that you grazed nerve.
Same happened to me, sudden uncontrollable chills, felk like a shit and had around 37 to 38 body temp then those chills came and I was like WHOAA wtf is this shit, i went straight to the hot bath and stayed there for like an hour.
Take some 400mg ibuprofen it will do wonders, and check if you got any lump, red and warm spot, etc.