Hello there!
I have an epileptic Border Collie too. The first thing is DON'T PANIC! It looks horrible, but the dog doesn't actually know what's going on - he/she is out of it until the siezure is over. The times to watch out are when the fit lasts over 5 minutes, or if there is a cluster of fits in a short time (status epilepticus). You may be able to lessen the recovery period by holding your dog's head, stroking him gently and talking to him soothingly. However, KEEP YOUR FINGERS AWAY FROM HIS MOUTH!
Ask your vet about Diazepam rectubes: these are squeezy tubes of valium which can stop the fit almost instantaneously, although the administration is not fun (you whip the cap off the tube, stick the open end into the dog's bum and squeeze!). The fastes way of stopping the fit is by injection, but your usual dog owner cannot do this - hence the rectube, which is almost as quick (seconds only).
There is a very informative and helpful site (with a message board) at
http://www.canine-epilepsy.net or
http://www.canine-epilepsy.com although I think the first is the better.
My BC had 4 fits in 35 minutes on 30 October 2001 (he was three then) and had to go to the vet at 4 a.m. - since then, he has been on phenobarbitone tabs twice a day, and has had NO FITS SINCE :)
Keep talking to your vet, get your pup medicated (he may be a bit woozy for a week or two, but it wears off) and stick to it faithfully,
to the minute if you can (irregularity in medication can be dangerous). Ask your vet about the rectubes: they will not be cheap, but a) they could save his life and b) you may never need to use them, but it's better to be safe than sorry!
Good luck to you. You can e-mail me if you need more info or support! Remember, it's not a death sentence, as my little chap can certify!
Snorri
Twilight Zone Epi-campaigner
:D