I think true Reiki is when the person administering it is a channel for Divine Love energy flowing out of them. This is just another name for God-- whose Spirit Energy is what gives everything life.
As you know- Since the person administering Reiki cannot be effective if thier self-ego is blocking them as a channel, it is not them, but God's Energy flowing through them to the person.- so maybe it wouldnt hurt! Just tell your Reiki Practitioner your situation, so that they are aware there are entities hanging around you.
So I think you should definitely see a Priest- and it wouldnt' also hurt to see a chiropractor as well as a Reiki practitioner who has the Love of God in their hearts and will allow Him to flow through them as an empty vessel.
Meantime, I'm still praying for you- and that God directs you to the right priest.