retracting testicles from smoking marijuana

i've been smoking lightly, every night a couple hours before i go to sleep, for about a year now, mainly due to a high stress job. Well in the last week, i noticed when i was "coming down" the muscle that controls the position of my testicles is overly active. At first i thought it was just in my head, but realized it's not. I could get the muscle to relax if i really thought about it, but if i was busy i could feel it constantly wanting to retract into my body. I didn't think it was a serious thing until i was having private time with my girlfriend and one of them retracted all the way up to the side of my penis. It's not painful at all, but it's uncomfortable. I can constantly feel the muscle in between my leg and penis slowly flexing and relaxing, thus making my testicles retract as well. It's hard to sit or lay comfortably because it feels like i'm not sitting down all the way, because it wont relax fully. Since i only noticed it when i was high and I'm pretty freaked out, i'm not smoking anymore...but i can still feel it sober. I suppose my question is this... am i just suffering from a strained cremaster muscle (i think that's the right one) and that's why i can feel the movement more than i normally would? or is there something more serious such as some type of bizarre hernia and/or an issue with my prostate. because some times it feels like if i strain too hard that my testicle(s) is(are) going to explode, which would really ruin my day.