Seizure again...

Merlin had a seizure. He has been going about three weeks between them so it was about due. They do not seem to be DM-related, could be a brain tumor, or could just be late onset epilepsy. He's had them for just about 13 months now. It's pretty routine for me now though I sure prefer it when it doesn't happen. Mainly I get upset because I don't like not knowing what is causing them and if it is going to shorten his life faster than DM.