Good Vibes that everything comes out ok. The blood test will test liver, kidney etc. Sometimes they cannot diagnose a seizure and it could be just a one time effect.
Seizures can be caused by a variety of things including both primary and secondary epilepsy. They can also be the result of a blow to the head, calcium deficiencies in nursing mothers, end stage heartworm disease, toxic plants, chemicals, fertilizers and poisonings. There is even evidence that seizures may be have a hereditary factor involved.
The blood work will hopefully tell you something and hopes that everything will be ok!