stop wearing boxers... they ride up, and squash your balls against your leg, trapping heat and cutting of circulation. when you toke, you prolly relax and slouch a little, which speeds up the process.
sounds like trash, lol, but i know someone (a helper of mine from years ago) that went through something like this before, he had said that sometimes, for no reason at all, it felt like someone just up and slapped his nuts! he went to dr after dr, one wanted to do exploratory surgery to see if his testes were tangled up together inside his sack! he never went with the procedure, and had mri's and exam after exam before he went to a specialist and figured out what it was.