Two years ago I stepped on something in the water up north that went crunch and stuck me with something.
It didn't hurt much for about 10 minutes but then it started to hurt and got progressively worse.
I tried the hot water, which sort of worked a bit while my foot was in the water but that limited my movement a bit and wasn't at all stylish so I ditched it.

I eventually took a couple of Neurofen Plus, and within about half an hour the pain had mostly gone to the extent that I was up and mobile again.
I'm not sure if it was just coincidence. I will try it again next time it happens.
Or someone else can try it and report back.