I had a seizure disorder until I was about 12 (just stopped having them, don't know why). When I was 7, my doctor put me on a new medication (don't recall which one). I had an allergic reaction that caused the worst seizure I ever had. While being transported by ambulance, my heart stopped. Obviously, they managed to get it going again (unless I'm a zombie

), but it was a near thing. In order to try and keep my seizure disorder under control, I was pumped full of Dilantin (I'll
never forget
that name).
I had an allergic reaction to Dilantin as well, which triggered
another life threatening seizure and resulted in a case of Steven-Johnson syndrome so severe it was initially diagnosed as Toxic Epidermal Necrolysis. I spent the next eight weeks in pure agony, half the time wishing I hadn't survived the first major seizure (let alone the second). Not the best year of my life by any means, but I survived it (even though the doctors thought I wouldn't).
The experience changed my entire outlook on life, and drastically refined my definition of "pain".