I agree with the advice you been given here
I have experienced the things you mentioned in my own practice,
sometimes I find I get all this sensations on my hands and body and my clients don't feel a thing, or the reverse can be true. The Reiki Master that taught me once told me that even when nothing is being felt great healing can be taking place.
Also keep in mind that doing Reiki on others also has a Healing effect on you, so aside from empathy( feeling such empathy for your recipients that you actually feel their pain/symptoms) your own blockages , and personal issues and/or illnesses begin to surface so it is important to keep grounded and centered and also work on your self as much as possible to keep yourself healthy and clear. In the case of empathy I found that when I choose to let go of the people I am healing to care for their own health and life( after all in most cases they are capable of making their own decisions) the pain goes away,thats why when I teach a Reiki class I take the time to tell my students to do their best to let go of any attachment to the outcome, for in most cases the responsibility for someone's health falls on them. However when it comes to people we love this can be difficult.
gash I am ranting again!!
From beyond the rainbow
ReikiDragon.
