Hi,
What you are describig sounds very exciting and unlike normal auras. In fact it sounds more like the beginnings of a migraine attack and with you saying you can feel faint I am wondering if perhaps you are forgetting to breath properly during these periods of great excitement. Have you learnt some simple psychic tools like grounding and centering? Those will help you keep your feet on the ground and earth you so that you are more able to cope with these attacks. They do not sound very helpful to me at all and I feel that if you were more in control then you would benefit more and be able to use your skills to help rather then for fun.
There is a long standing debate about indigo and crystal and now the newer rainbow children. Whether or not that do in fact exist or whether they are new age terms just designed to sell books. I don't fel that your aura is crystal, at the moment it is leaving behind a residual as if you are tearing around like the wind from one thing to another and not in any one place at one time. Perhaps you need to slow down and settle and do some researching and gain some concrete knowledge about auras and vision fields and energy patterns. That will help you see through these times.
If you still keep feeling faint then please mention it to your doctor and these bright lights that you see too
