I have Temporal Lobe Epilepsy that went undiagnosed for over 15 years. During that time, I had several EEGs, none showed anything significant. Some of those tests were sleep deprived, I remember the strobe and hyperventilation phases well. The strobe lights would cause me to see strange shapes (eyes closed of course) but never elicited a seizure potential. Hyperventilation, I've always had trouble with that, even at the doctors office when they're listening to the lungs. I'm not sure it's related to seizures either, I've never been told so during the EEGs. My symptoms eventually worsened, and my seizures were documented by a 24 hour EEG that I wore, though, ironically, by that time, even an in office EEG would have confirmed them.
Looking online and limiting the symptoms to just neurological, just for this discussion, hyperventilation can cause the following:
Dizziness, unsteadiness or instability, faint feelings (rarely actual fainting), visual disturbance (occasional blackouts or tunnel vision), headache (often migrainous), parethesiae (i.e., numbness, deadness, uselessness, heaviness, pins and needles, burning, limb feeling out of proportion or "don’t belong"), commonly of hands, feet, or face, sometimes of scalp or whole body, intolerance of light or noise, large pupils (and more, I'm sure)
Hope this helps.