Saw the vet this morning and he agreed with the diagnosis (Feline Orofacial Pain Syndrome) and put her on phenobarbital. I successfully gave her my first pill tonight! (Thanks for the video, Gator) He is following the treatment protocol, and if this doesn't work he will move on to gabapentin. I am thrilled. It doesn't explain the seizure, but so far she does not seem to have had another one, so who knows. And this horrible symptom of her struggling to eat should be gone in 3 to 7 days! THis also means that she will not have to stay on steroids, so I think when the current shot wears off she will also stop being diabetic.
She is doing ok on .5 and I am not concerned with improving her numbers, since I think this is very temporary. I know I have to be careful, because eventually she should not even need the .5---so, obviously, I will keep testing (although less frequently).