First of all, if you have been attune to Reiki visit a metaphysical practitioner, as attunement to Reiki is a spell that needs to be removed. It is not a good spell and if you decide to heal through meditation, it blocks the healing process of your inner self. This removal must be done in order to balance your aura and get you functioning in harmony (or reconnected) with the Universe.
Then there's the Christian Medical and Dental Associations:
Christians should completely avoid Reiki as it violates biblical commands against contacting spirits (Deuteronomy 18:9-14; cf. 1 Corinthians 10:19-22). Anyone practicing or promoting Reiki should be required to describe the practice thoroughly and clearly, especially its spiritual and religious nature.
Unfortunately, such an approach doesn't seem to work. EoR has had experience of trying to persuade a group of reiki-believers that they were being taken for a ride. When logic and facts didn't work, he tried the "Reiki is an evil occult link with the Devil" approach, since the group were also devout Christians, but also to no avail. EoR remains constantly amazed by the ability of believers in one unsustainable belief system to simultaneously believe in a plethora of other such systems, even where they contradict each other.