Hi, sorry to leap in here but if I may share this - I also suffer from scintillating scotoma & have episodes of paralysis when I simply drop to the floor ; I have hemiplegic migraine attacks & have to take unpleasant meds to ward off the attacks. It works to an extent.
I can usually tell when an attack is coming, from the "alien writing" I can see in gold on a black background, superimposed over everything with eyes open OR closed; or else jagged, serrated half-circles - which are standard migraine prescursors.
But this is completely different from the visions I see when meditating or just lying resting - these are clear; like a well-tuned TV screen. I always suspect lights of any kind to be related to my "affliction", but possibly that is wrong. If you google Dr Klaus Podoll you'll see the amazing "migraine art" that sufferers have produced over the years. In fact, some people have proposed that migraine could be a kundalini-related "side-effect", & part of an evolutionary experience - not sure if I'm making myself clear. . . .though I certainly could do without any throwing up & pain in the head which sometimes (but rarely) occur.
I'm sure my family is embarrassed by my behaviour sometimes, when I stop to admire a wall surface which is vibrating, or stare into the sky at the beautiful patterns I see. I've never decided whether this is migraine-related or not; I can "stop" seeing these by an effort of will & reminding myself that I need to see "consensus reality" in order to function. I also see "through" my closed eyelids sometimes, in a dark room. . . another of my frequent meditation experiences is seeing the "yin-yang" symbol turning slowly.
It's oddly comforting to know there are others here with similar experiences.
