Wow, vets are expensive. After all the tests, we have found that he is perfectly healthy. His white blood count was a little elevated, which indicates an infection, so he's on an antibiotic. Infections can cause seizures, but other than that, we don't really know anything. Four in one day is unusual, but we're watching him and he hasn't had any today. So hopefully it was an infection and won't reoccur. Thanks for the thoughts! Just happy to have my little guy home!