You have gotten some wonderful advice here and I only have just abit to add. Comtinue to drink the water, more than you would usually drink as this helps to flush out your system. During Reiki toxins can be released cleansing on the physical level.
The cold you describe happens to me every time I have energy work done. My first reiki Master describes it as a "divine wind". When the stagnant energy is moved out and the good is moved in it creates a wind of sorts in your body. Perhaps this is what you experienced.
The need to relieve yourself is also a natural reaction to reiki as your body is releasing waste on many levels.
Hope all this helps, Come back anytime!
Love and light,
Tracey
