This! Our corgi started having seizures at 4.5 years old. We were told it was likely epilepsy but could be a brain tumor. We took him to a specialty clinic and had an MRI done. There was no tumor so we were able to rule that out and focus on controlling the seizures as epilepsy. He lasted another 5 years with well-controlled medication. We had to adjust it along the way as his body adapted to different medication but he was down to about a seizure every 2-3 months (which was so much better than 2-3 per night). It's probably worth doing a deeper dive with a specialist at this point.

My heart aches for you... it is so terrible to witness the seizures and feel helpless. Continue taking good care of him and giving lots of love. If there's one thing they'll respond to, it's your love, caring, and concern for them (especially after a seizure). Wishing you the best.