i don't think the health anxiety subreddit will let me post this lol so i'm here again. yesterday i had a weird brain zap, not painful but easily one of the most uncomfortable and frightening physical sensations i've ever felt. it felt like a lightning bolt hit the right side of my head and went through my brain to the left. the sensation lasted about 2-3 seconds but freaked me out majorly. 

this was almost exactly 24 hours ago (i was having lunch) and i have not had another zap since then. 
i didn't have any other symptoms at all along with this. google said it's a very common SSRI withdrawal symptom but i am not and HAVE NEVER taken any such meds in my life. i then went on the epilepsy subreddit and there's people with similar stories, which has now convinced me i have it too. 

for some background, for 6-8 weeks (may to july) i had the worst health anxiety episode i've ever had with constant anxiety 24/7. (i'm 18F btw). ever since the second week of july, it's somewhat calmed down (college started which is a distraction) but i've still been anxious over my health and still catastrophize majorly. yesterday before the brain zap i was somewhat stressed over a similar health issue (turned out to be nothing), watching a kind of scary movie, and dehydrated (i have the weirdest things happen to me when i'm dehydrated.) however, google doesn't suggest that any of these could be the cause. i have exams starting next week (also kind of stressed about those) and am now constantly terrified of having a seizure on those dates. 

i have no idea what to do and there's no way to convince myself this isn't epilepsy, a tumor, unruptured aneurysm or something along those lines. sorry this is so long ://