Jkurz1,
What you described is EXACTLY what happens to me when on Ephedrine. I found that if I drink tons and tons of water then it helps with the pain down below. However, I just stop using Ephedrine and the pain goes away. And when I started it back up then the pain returns. So for me, I KNOW that Ephedrine does something to my balls and around that area.
I'd follow one of the bro's advice and stop Ephedrine for a week or two and see if the pain returns in that timeframe.
My bet, it's the Ephedrine.