The scariness you are feeling is not the Reiki energy, but the clearing of fear from your body, mind and spirit. The fear can be quite uncomfortable as it is exiting. I also experienced this and most initiates do....Did your Reiki Master tell you what to expect during the workshop?

Sometimes after a Reiki treatment, a series of treatments or especially after an attunement like you had, a person will begin to detoxify. Toxins that have been stored in the body may be released along with feelings and thought patterns that are no longer useful. This doesn't always happen, but it is important to understand what is happening when it does. These releases may take place and surface in the form of a temporary skin rash, increased urination, runny nose, cold symptoms, diarrhea, Body Odor , a need for more rest, emotional releases or outbursts, crying, a temporary mild form of Depression or sleeplessness. This release should be supported rather than stopped. Do not try to suppress these symptoms with medications, but do let the toxins leave the body their own way. Whenever change takes place, even good change, there is an adjustment period so that the body and various parts of your life can adjust to the new conditions. You may find that old thought patterns begin to change, things may come to mind you haven't thought of in years, as you begin to look at life and approach it from a brand new perspective.

You will integrate the new energy and feel better in 6 weeks or so.
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The scariness you are feeling is not the Reiki energy, but the clearing of fear from your body, mind and spirit. The fear can be quite uncomfortable as it is exiting. I also experienced this and most initiates do....Did you Reiki Master tell you what to expect during the workshop?

Sometimes after a Reiki treatment, a series of treatments or especially after an attunement like you should had, a person will begin to detoxify. Toxins that have been stored in the body may be released along with feelings and thought patterns that are no longer useful. This doesn't always happen, but it is important to understand what is happening when it does. These releases may take place and surface in the form of a temporary skin rash, increased urination, running nose, cold symptoms, diarrhea, Body Odor , a need for more rest, emotional releases or outbursts, crying, a temporary mild form of Depression or sleeplessness. This release should be supported rather than stopped. Do not try to suppress these symptoms with medications, but do let the toxins leave the body their own way. Whenever change takes place, even good change, there is an adjustment period so that the body and various parts of your life can adjust to the new conditions. You may find that old thought patterns begin to change, things may come to mind you haven't thought of in years, as you begin to look at life and approach it from a brand new perspective.

You will integrate the new energy and feel better in 6 weeks or so.

In my Reiki I initiation, I had memories come up and float away, but never anything bad or scary. Reiki can bring up some past issues that are ready for a cleansing. I could only suggest that you keep using the Reiki on yourself to complete the cleansing. Be sure to be drinkning a lot of water. It could be toxins coming loose in your body and you want to get them on out. I will tell that Reiki energy is ONLY loving energy. There is no harmful energy in it at all, if it is true Reiki. What you are experiencing could be something else. I pray that you will go to your heart and focus on God and Purification. It is very powerful to ask for God's assistance and intervention into any thing that is not for your highest good.
I hope this helps.

Oh my Gosh, I was just experiencing the same kind of thing but with muscle tension and pain. It wasn't from using Reiki but another form of energy healing. I actually quit using Reiki because I was scared of my strong reaction. I get almost the identical reaction to using EFT, TAT, ect. I read daizys response to you and now I feel a little more comforted. And daizy if your reading this, I just ask you almost the identical question under the subject line--why the headache. I guess I'm not crazy.
marylynn