A family member of mine has had chronic migraines every 3 weeks for about 5 years straight, I'm not a migraine expert but I do know that increased stress levels catalyse the (upcoming) migraine. If you see how wound up he was after losing game 2 it's no wonder that things turned from bad to worse. Also, temporary loss of eyesight (as hilarious as it was to poke a bit of fun at), blurriness and everything he described is text book migraine. Migraines usually start with having "spots" on your eyesight and that graduallly turns worse as the headache sets in. Limbs feeling tingely, more spottiness on your retinas and eventually a bursting headache is what migraine does to you.
Best you can do is just sleep it off or get some meds.
It sucks for everybody involved but shit happens. Props to Von for taking it like a champ.
I'm right there with that family member of yours. I get them as often as twice a month to as infrequently as once every six months. I'm all too familiar with the symptoms. From my experience stress, tension in posture or physical straining in awkward positions (where the neck gets torqued) is my personal catalyst.