Sounds to me like a pinched/irritated femoral nerve. The femoral nerve runs through the ilio-psoas group of muscles, and can often become impinged if those muscles are tight or overworked, as other people have already mentioned. I've had this badly from time to time, but not from bking.
If the doc clears you of all of the scary scenarios (Which I hope and feel pretty confident he will.) That's the place to look, and how overwork/bad position/bad seat fit might be causing it.
Keep us posted, and Good luck!