Is he on Phenobarbital now? It is obviously not working. Lady went through that years ago (she's been epileptic for nine years) and started having cluster seizures. We added potassium bromide and it has made all the difference. She only has a a seizure once a year, maybe less now.
Has your vet been doing bloodwork to check the level of medication in his body? That's important to do, to make sure he is getting the proper dose.
Is there any way you can get him to another vet? You need to get Bailey's seizures under control or they will just get worse and more frequent.
This website is wonderful:
Canine epilepsy and diseases that cause seizures in dogs