Let me preface my post by saying that I have always been a very aggressive medical person (think House, MD) and it often stems from everyone else trying to CYA due to litigation possibility. I believe the majority of people's responses these days are for CYA purposes.
What you describe, is probably occuring with other people as a base line. They just didn't have a sentinel event that caused them to actually find out they had those symptoms. Similar symptoms can be found with someone who drinks before diving. Can they die too, yes. Can they do something stupid underwater, yes. Can a diabetic have issues underwater, yes. Is your sense of excitement and adventure worth those minority chances, that your were probably taking before and just weren't aware of? For me, YES!
Whats the worse that can happen? Well I guess your 2-3 second seizure can go status and you die underwater. Do I think that the diving environment will affect you differently than your everyday life? No. Do I think that if you blow the recommendations that prevent DCS that something can go wrong, yes! Hey look at it physically, while an air embolism in the brain, causes a blockage so that oxygen can not flow to a portion of the brain, in the area of your aneurysm its slightly bigger, could just be the life saver in your case. Bubble will slip right by or maybe even break down as it hits the edge of that aneurysm. Is nitrox a restriction? I would say Nitrox would probably help, the increased oxygen, might help you out if you had an air embolism, at least your brain was saturated with more oxygen that is normal when someone strokes out...maybe that will buy you extra time.
Bottom line is, no one can give you an exact answer. Not a neurologist who is also a diver. We just don't know. As one doc pointed out, the pressure gradient is not going to affect it. He mentioned other activities which might make it worse...so sure if you have a seperate event underwater which causes high stress, then that might make a difference, but probably not. However, you are just as well informed searching the net for articles as asking people on here, but I guarantee that people on here will say, "Oh my god!, you are crazy for diving!" Its beacause they don't know and that is the default answer, but as previously stated there are plenty of other conditions that people dive in that are much worse, like drinking and diving and I am sure people do that all the time too. I don't condone it and again, you MIGHT DIE!
My best resource, since I am baltimore, MD based, is the Adam R Cowley Shock Trauma Center. They are leading the way in critical care treatment across the world. They are always happy to answer questions posed to them. Dr. Robert Rosenthal is currently in charge of hyperbaric medicine at Shock Trauma and has access to loads of resources in every field and how it relates to dive theory. His contact information is:
rrosenthal@umm.edu
(410) 328-6152
Shock Trauma Center PBG02
Research Specialties:
1) Global and Focal Cerebral Ischemia: Evaluation of novel neuroprotective strategies in both the pre-clinical and clinical settings.
2) Traumatic Brain Injury: Development of novel pre-clinical models for the study of TBI
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