My father, who is 61, was diagnosed with transient global amnesia 4 years ago. He has been to
two neurologists. We were told that the chances of him having more of these "attacks" were slim to none and that there would be no lasting side effects. Now, 4 years later he has had 6 attacks and cannot form a complete sentence. His doctor simply says that it is one of the side effects. Could this be something else? Any help will be greatly appreciated.