I also really hope you are writing after seeing a vet!
I have a 2 year old beagle who was diagnosed with idiopathic (no known cause) epilepsy at 16 weeks. She had about 10-15 seizures in one day, worsening each time. We now know she had been having milder seizures for a few weeks prior to this. She had to have an MRI scan and spinal tap at a specialist veterinarian hospital prior to diagnosis.
We were advised to put her to sleep more than once.
She was started on epiphen, this was changed to phenobarbital (as she had cluster seizures) and then potassium bromide was added.
I found her litter brother through Facebook with exactly the same issues. Their breeder was not interested (KC Assured Breeder).
Both these puppies went a year seizure free and are both off of medication now!! They are 2 pretty amazing beagles. Unfortunately, it's not always the way it goes. You will need insurance or deep pockets, as your pup is so little, tests will need to be done to rule out other possible reasons for seizures.
Fingers crossed for your pup, please let us know how he is x