What are the risks of past life regression therapy?

I have found by doing and researching through follow up calls with people that experience a past life regression the majority of the people claim they miss their old life.

Having a past life experience is like having a dream.  Through using Regression therapy I have seen people so happy it is beyond belief, however the ones that miss family, friends and their old life can be as much as a few weeks of morning the loss of the old days.  

I have preformed hundreds and other than the slight morning period I have never seen any other risks