I've experienced something while taking each and everyone of my Reiki attainments and classes. I remember my eyelids pulsating and my body light like the beginning of a migraine but not quite a migraine.

The buzz is, I believe, is attributed to higher levels of energy. The healing process is like turning on a light bulb, so to speak. Or like water molecules jumping back and forth in a boiling pot (sorry, I'm bad at analogies sometimes :)).

The glow can sometimes be attributed to a large vibrant aura, I believe. I have known many dedicated healers who carry an air and charisma that stands out in a way that is difficult to explain. It may be that your sensing part of that.