Preamble:
I have no epilepsy nor a phd in any med related field.
So everything below is to be taken carefully;
under medical supervision at best!
Is that epilepsy caused by changes in the content (visual effect) or is that the flickering of the monitor itself (subliminal)?
if it's the latter.. go and get yourself an
E-Ink iBook reader to read the pdfs Paul offered.
Those have NO refresh rate at all so there is no flickering at all;
you can even turn off the backlight and it'll appear to be printed -grey'ish- paper
the only time the page will be refreshed is when you go to the next page (just as a regular paper book)
just make sure it's indeed e-ink and you shouldn't have any issues with that.
At least that's what a former colleague said suffering from epilepsy himself.
All that'd be left is to ask someone to upload the books to the reader on a computer I'm afraid;
but that should be possible I hope.
If it's the content causing issues,
you could ask someone to assist you using a computer,
or precisely to set it up for you to be as safe as possible for you to use.
the things you'd want are
A 200Hz or more refreshing backlight (say an LED monitor) to reduce the chance of that causing issues even if it's not the flickering backlight but the content.
And then have him set the graphics driver for you, limiting the framerate to something you can tolerate (say 12 fps - ask your doc first)
and limit the hue and contrast to prevent you from being flashed with alternating bright colors.
That way, you should be reasonably safe to use a regular computer for about as long as you can use a tablet right now.
Still you'd need to stay clear of unknown videos maybe best to disable videos and animations in your browser altogether just to be safe on "unknown websites".
Ask someone you trust and who's well above average in
'computers'.
He must not make a mistake of course.
Maybe someone you know from college

(that's why I mentioned it at all)
'sid