Hi, Redranger.
Welcome! I'm glad you found us here.
Wow. You said it very well. "Dazed and Confused" is how lots of people (including me) feel when they are first diagnosed.
Tonic Clonic (Grand Mal) seizures are generalized seizures. In other words, they spread over the whole brain. Usually generalized seizures can be picked up by an EEG. Focal seizures (partial-brain seizures) often aren't picked up by an EEG if either they aren't happening at the time, or they are too deep in the brain to pick up. MRI's are sometimes negative when the seizures are a relatively new thing.
Your doctor did the right thing to send you to the Mayo Clinic. You deserve the best brains to figure this out. As a first step, they'll do a bunch of tests to rule out conditions that mimic epileptic seizures, like some cardiac conditions, sleep disorders, TIAs (mini-strokes), etc. If you are suffering from one of these diseases, your seizures wouldn't show up on the EEG. Get ready to be poked with needles, every kind of picture taken, a cardiac work-up, sleep study, and probably an inpatient video EEG. It's tiring, but needed.
http://professionals.epilepsy.com/page/seizclass_nonepileptic.html
I'm guessing your doctor still has you on meds because he doesn't want the seizures to continue, or to get worse, until you are seen in Rochester. He's covering your bases. Seizures have a nasty way of perpetuating themselves. The quicker you get them completely stopped, the better the chance you will someday be medication free and seizure free for life.
Will you keep us in the loop and let us know what they say at the Mayo Clinic?