A friend of mine runs two laboratories so she is, like me, a hard-headed, fact-based proponent of the scientific method based on reproducible, measurable empirical evidence.
However, she is also a reiki practitioner and has given me a couple of sessions. I can't say I felt anything in particular but I did see a few colours, (although she had told me I might, so the suggestion was planted).
She lit candles and put on some gentle, new-age type music, (which she refers to as " dolphin fart" music), and the whole experience was extremely calm and relaxing.
In my opinion, coping with the stress of a disease like MS means that anything that gives you respite is a good thing,