Hi Ray,
Speaking from my experience with working with a child that has epilepsy and from what I have read aboout reiki and epilepsy, be very careful.
When I have been "reiki" around this child her seizures are more prominent. When I guard my self and do not put out too much energy she is OK. I have not experimented with this so could be coincidence, but I can feel her seizures come on and don't think it is coincidence.
I have also read, can't remember specifically where, that reiki can trigger seizures and should be used with caution. I have heard this about bi-polar and other brain issues as well.
Let us know how it goes.
Love and light,
Tracey