If you are not getting any better, you are not doing yourself any favors to keep doing something that is not helping.  If you have a personal injury claim, you will find that unhelpful treatment can negatively impact your claim.  First talk to your doctor about your concerns.  If you are not satisfied, do not hesitate to make a switch and try something new.   It could make a difference in your recovery.   The sooner you can return to pre-collision condition, the sooner you can put the injury behind you.