I don't know how you are meditating or what your routine is, so just going from what you have posted so far,... your statement above also usually comes from a reiki type practice... I would say that the light you see from yourself is just your own energy, and yes, this is what you would use to form a shield from...(just an answer for your first post)..... but the fact you so easily "see" this and "feel" it is curious, most ppl with no training or deep interest never reach this stage...(of course though , as previously stated, it will most likely pass)... if you don't mind my asking, have you had any training at all with this type practice?..