I agree with Candace. My son has seizures (athough not a dog but the physiology is the same). The side effects of the meds can be just as bad as the seizures themselves. My son is on 3 seizure medications. One of them interfered with his thyroid function so new meds were added to balance that but a side effect of that medication is hair loss which is happening to him--he's only 23 and has a big bald patch on the top of his head. Another medication he takes causes him to be depressed and makes his urine smell terrible! He also sleeps 18 hours a day.
I say get your second opinion and tests but don't be in a rush to medicate unless the seizures become more frequent or tests show there is something wrong.