FWIW, I wouldn't worry about the quality of medical care in RSA. Their physicians and diagnostics are better than the USA average by a damn sight.
Second issue, unexplained seizures are always a cause for concern prior to major travel. I'm guessing you've had a full workup (MRI, EEG, etc) and all was clear? If not, get those things done prior to travel.
Global Rescue isn't going to fly you back to the USA for a single seizure from which you recover with no further sequelae, I'm sure. They're more of a catastrophic injury/illness carrier.
