I have had some exposure to Reiki. I even got certified Level one. (which doesn't amount to much) I used to be a certified Massage-therapist/Drugless-practitionar in Las Vegas.
Here in Taiwan I have meet one energy healer master who is quite powerful. He was trained by his Grand Master in China, just north of Beijing, he has helped me alot, but even he makes mistakes.
I am somewhat sensitive to the energy of other people. In science fiction shows people would call me an Empath.
Reiki can be a powerful source of healing, it all depends on the Practitionar and his/her connection with the patient, and other hard to quantify variables
May I also recommend that Group therapy with role playing is also a powerful way to heal for every one who has expereanced trauma.
Also EMDR works very well for all Children, and for some adults it works pretty good to, for other adults it doesn't.
Reiki is but one kind of energy healing, and I have felt and seen the effects of some powerful energy healing. Some people do Taichi in advanced forms. or Chi-Gong.
Unfortunately according to my experience in the energy healing world. 20% are complete liars trying to steal your money and 40% are confused and overwhelmed by what they do and (though they try to help people) they often have no effect.
My advice, Keep learning Reiki, and when you have gained a level or two, move on to something else. The unseen world is too vast and too complex for any one system to help you really understand it. Often it is more about feeling it and doing it. Developing your sensitivity and intuition, and Compassion.
Bring works of darkness to light