Please Help My Boy

In October my boy started having partial seizures. I took him to the doctor and we ran blood work and X-ray etc. Things came back normal so we started him on phenobarbital. The seizures continue. I took him to a cardiologist and to a neurologist. Cardiologist says things look ok on his end and the neurologist says he seems ok outwardly ok but she strongly recommends an MRI. With all of the testing we have done, we still don’t have a clue what is going on. And I am out of money. Now the seizures are increasing in frequency ( as in multiple times per day within the last 3 days) and I’m terrified that I may lose him. He is only 5 ish! I don’t know that the MRI will give us the answer we want to hear but at least we will KNOW. Please! He’s such a great little cat. He runs to see me when I get home. I get down on the floor with him and he just rubs himself all over me with lots of head bumps. He sleeps under the covers next to me in bed. He is my friend and I don’t want him to leave me! Not without a fight. Any help you can offer is greatly appreciated from the bottom of my heart. Thank you for taking a moment to read this.