Unfortunately, without seeing you and reviewing your tests, I will not be of much help. It does not sound like, based on your description, all of your symptoms
can be explained by seizures. If there are progressive changes on the MRI, I believe this should be worked up further. Blood tests such an vitamin B12, folate, thyroid, markers for diabetes, and inflammation (sed rate and C reactive protein) should be checked. After review of the MRI a spinal fluid analysis may be helpful.