@maureendigi
A person with all normal tests can still have frequent Epileptic seizures. Was his EEG and neurological exam also normal?
Did any of the medications ever decrease the frequency of his seizures?
Does your brother have any psychological problems? If so, and those problems have gotten worse recently perhaps he may be having PNES (Psychogenic Non Epilepsy seizures brought on by psychological issues. Sometimes people have both Epileptic and Non Epileptic seizures (NES)
What type of seizures does he have?
Being admitted to the Epilepsy Care Unit is a good idea.
Here is some information about the Epilepsy Care Center at Mayo Clinic.
https://www.mayoclinic.org/diseases-conditions/epilepsy/care-at-mayo-clinic/mac-20350102
Take care,
Jake