Our precious boy, Beasley, had a long (3 minute), severe seizure today, the first one ever. He is 13.5 yrs. He has since been very nervous and anxious. He's been rubbing the top of his head on the carpet for some time, recently has increased thirst, has been toppling over occasionally the past few days, and very stiff on the stairs, plus reduced appetite and occasional vomiting. The vet recently recommended teeth cleaning, which was done. From what I am now reading, he might well have a brain tumor, but he can still run 4 miles three times a week with great joy! He will be at the vet Monday when they open, but I dread possibly learning the worst. He is the dog-love of my life and I want him to live many more years.
My b boy had a grand mal seizure just before his tenth birthday. Afterward, he was confused and listless and seemed to be in a daze.
We rushed our Spencer to the 24-hour animal hospital, where they told us he almost certainly had a brain tumor. Our regular vet advised against $2000 worth of testing and MRIs that would tell nothing but bad news and put Spencer on Dexamethazone for a week to reduce the inflammation in his brain. After that, we began to see gradual improvement. It took him several months to get back to "normal." I say "normal," because he has Fanconi, and our "normal" is constantly shifting.
The person who helped us most was Dr. Steve Gonto. Dr. Steve reviewed Spencer's labs and adjusted Spencer's diet from high-protein to low-protein with different supplements. I'm not a vet-- and your situation may be nothing like mine-- but Beasley's seizure could be kidney-related (hence the increased thirst and vomiting) and, if so, may be controllable with dietary changes and the addition of certain supplements and/or meds. You could ask your vet to run a CBC, a venous blood gas (checking kidney and liver values) and a urinalysis, then see what the values tell you.
Spencer had also been having several "tells" before the seizure, though I had no idea at the time. One was rubbing his head on the carpet; the others were tilting his head, shaking his head and acting a little stiff, all of which he was doing the day before the seizure. I wish you and Beasley the best and hope he never has another seizure!