A good friend of mine at university has epilepsy. She was diagnosed in her first year and is in her third year now, still going strong!
I didn't realise the extent of it until we had a chat about it one day on the train back from the internship we both do. She was telling me how she used to have seizures almost every day in her first year, sometimes several times a day, before being diagnosed and given some medication (though she still has the seizures once every couple of days- the effect of it seems to be wearing off). Something she was really upset about was having her driving licence taken away.
She's had lots of incidents due to it- the most striking one (which she finds funny now!) is basically, a few days before she had a piece of coursework due in, she had a seizure whilst she was about to write the essay. Obviously she had to have a lie down, have a sleep, and so forth, and when she returned to carry on her essay, she couldn't really remember what she had been doing. It was now much closer to the deadline, so in her panic, she grabbed the first notes she could find and wrote up her essay.
The following week, both she and the girl she lives with (and who does the same course as her) received emails accusing them of plagiarism...She couldn't figure out what had happened, until she realised that she had used her friend's notes rather than her own by accident (as they weren't handwritten, she couldn't tell the difference, and her seizure had made her very confused for when she was writing the essay up!)
On the plus side, she's made it to third year with good grades every year, she has been involved with a prestigious internship for the past 18 months, involving going back and forth to London once a week, and she even has a job, as well as being on the committee of the squash club! She's a truly incredible person and an amazing example of what you can do even with a condition like epilepsy. Whenever I panic about exams or think I'm crap and am going to fail everything, I think of how much she's managed to achieve and suddenly feel very motivated again!