Cracker has said a lot of what I was going to say.
We have an epileptic dog who's had seizures for 3 years now. While scary to watch, Canine epilepsy can sometimes be managed with meds and patience. Sometimes there are triggers you can pick out and sometimes the cause is unknown.
What are you feeding your dog? Sometimes switching to a higher quality or grain free food helps. And don't rule out the meds. Topaz is on both Phenobarbitol and Potassium Bromide as well as Taurine and we feed raw (to rule out food and to avoid the recalls).
See a new vet and keep a journal and remember that although it's hard to watch, it's harder on us than it is on them!
We have a blog for our dog located here...
http://topazseizures.blogspot.com/
I have a page on my own blog:
http://www.peargirly.com/blog/canine-epilepsy/
And here's a great site to start with:
http://www.canine-epilepsy.com/
I always suggest that people who have a seizure dog, join this email list as well:
http://www.canine-epilepsy.com/subscribe.html
The people on that e-list have been dealing with canine epilepsy for YEARS, some have had multiple dogs with epilepsy, and they are VERY helpful and knowledgable when it comes to epi dogs.
Feel free to private message me as well if you need anything.