Yes, this can happen, and will happen if you are open to the experience.  All of our memories are trapped inside our tissues cells at the moment of trauma, including the emotions we experienced or didn’t allow ourselves to experience at the time.  When the physical tissues are released so are the emotions contained within them.  This is something that you have to allow to happen, it will not happen unless you’re ready.   Getting to this step of allowing your emotions to release during and after treatment is crucial to creating permanent structural and functional change.