Thanks for the responses - and thanks to company health insurance, I am headed to a neurologist who can hopefully give me some more information on this, and ensure its not something more serious. Other people smoked from the exact same bowl, and mentioned getting thoroughly stoned, but nothing more... I am typically a cannabis proponent, and am very aware that saying "Weed caused a seizure" is exceptionally unusual, and entirely undocumented. However, I have no doubt that from the moment I took that bong rip, I just kept getting higher and higher - the root cause is entirely unknown, but the trigger for the 'mental seizure-type event' almost certainly was the THC.
SPC123, your experience seems really, really similar to mine - which is quite encouraging given the strange circumstances I find myself in. I also had a coke earlier in the day, and I rarely have caffeine, so I think that this may have helped lower my seizure threshold. Again, just guesses at this point.
This was the first time I have experienced something this strong, and I have no history of any sort of mental illness, seizure, depression, or anything at all. Though there was one occasion, about 10 months ago, when I smoked a bowl of weed (my weed, my pipe) at a Pretty Lights concert. I was in the crowd, quickly smoked the bowl, and had tunnel vision and similar mental state set in. It was not as overwhelming or intense, and it went away after less than 60 seconds, but it could be demonstrating some sort of trigger that randomly gets set off.
And uh, lets just move on from the "LSD makes your brain bleed, I swear its true" nonsenses, no need to dignify that line of thought with any further response.