On this site and elsewhere are a lot of reports from both women and men of this vibrating feeling like a cellphone in the genital region, and especially when the men write about it and about what their doctor said, there often seems to be an answer that involves a pinched or compressed nerve. See if you can start by asking about that, with the doctor.
I'd definitely get this checked out. It could be a hernia, definitely could be a back injury like a compressed nerve or disc, etc.
Give your doctor a call today or go to an urgent care center. Feel better, and let us know what happens.