Just thinking about it - my inner ear infection may have been close. I spent most of it out cold on Mersyndol though - so as constant pains go, that may have come mightly close... I just will never remember because I only experienced that pain for short periods and under medication (I'd wake up screaming and DH would bring me more pain killers) - where as my labours were alert and unmedicated.

This really is a tough one.