heya, i have a little experience:
one of my best friends friend has her level 1 in reiki so far and at my best friends party (she was there too) i got quite pissed and got kinda sick, i felt sooooo crap that she finally decided to do reiki on my stomach! it actually felt really good but once she stopped it came back but none the less it did work. and earlier in the evening everyone was swimming and someone jumped on my friends back and she really helped the pain with reiki.