Hi I know this is late but ive only just disovered your post - i had terrible constant groin pain for a number of years, docs would say the source could be the hip or back.
However, after further investigations I discovered I had low testosterone and they put me on testosterone patches... I eventually was given clomiphene citrate (which is not normal for a guy to take) .
Clomiphene citrate was the best med i had to stop the pain - Can you believe it was down to Pituatory Gland malfunction that was causing the groin pain? This may be the reason your getting pain down there - you may have low testosterone or estrogen levels or they may be too high?. The clomiphene citrate stimulates the pituartory and is also an estrogen blocker