I had a very strange experience with reiki, the practitioner puts their hands just above you and you can feel the heat off their hand miles hotter than a normal touch. When he was finishing I felt a light tapping all over my body and I turned to look to see where he was thinking he was right next me. He was at the other side of the room waving his hands about. How freaky is that? I didnt go for it again it was too weird for me.
I tried reiki a few years ago and felt the same warm sensation you did, such a strange feeling.
I've always been skeptic about reiki and such, I only went because my sister was dying to go and had a broken leg so couldn't drive herself so booked me in too as a thankyou for taking her. That morning I was laughing with my mates about it as I didn't know what to expect and thought I'd struggle to keep a straight face. I felt the same warm tingling as her hands were over me I couldn't believe she wasnt touching me it's such a strange sensation. It's so tough to explain how I felt afterwards, in a way lighter but also so tired, sort of like the feeling of a giant wave of relief after a stressful situation. Before she has started the session she had asked me if there were any area I'd like to concentrate on, I said no then after the session I asked her if she could feel anything from me and she explained she could feel a lot of energy around the top of my stomach/bottom of chest which she read as some sort of emotional trauma/anxiety. She was absolutely spot on I was going through something terrible at the time (I'm honestly one of those poker faced people where you really cant tell -and we hadn't even spoken for 1min before our session started). I dont understand what it is but I really do believe there is something in it and I thought it was a massive joke to begin with.
Last year the lady we saw moved abroad, my sis has since been to a few other people for reiki sessions and hasn't had the same experience at all unfortunately, so it may be worth looking at reviews or word of mouth (I'll add the lady I saw had only been practicing a year after leaving her previous job of 15years as an accountant, so it's not necessarily an experience thing maybe just some have the gift