Yesterday I had an incident with a nail, picking up an old board and it punctured my hand, the meaty part of the thumb. It bled a bit and I put antiseptic on it within about 15 mins. I throbbed for a while, then last night was very sore, could hardly use hand. I had a tetanus shot last year when I stood on a nail (yep me and nails have history).
Today I woke up feeling achy - thought it was from the physical work I did yesterday, but I've also got a sore chest and just started getting the shakes, feeling really cold and am feeling really achy all over.
Puncture site looks clean, tiny bit of discharge but not puss.

Is it just a coincidence?