I actually had something that sounded a lot similar to this the other day in round about the same area believe it or not, like I touched it and it was sort of like a sharp sensation? Have you had it since the 6th? Mine was only for like one day but if it doesn't go away go to your GP but I'm sure it's fine.
@bethany; tbh I think a trapped nerve would hurt a lot more but I don't know, I'm no expert I just know my mum had one in her back and literally couldn't move and had to be rushed to hospital to undergo an operation but ye obviously it'll vary case to case.