I reckon, since you think possibly they are cracked, a doctors visit is in order, be warned though, Co-codamol shows up a 'false positive' on drugs tests, so if your working, and all depending what, I should stay clear of them.
i was advised by my doctor to stick to one type of painkiller as they can counteract each other, and would agree that anti inflammatory would prob be best. ibuprofen OR ibuprofen gel (not both)