Hi Becky,
You could have a look on the last post I put up in the front of this forum "Useful sites for Myastenia Gravis".
It will give you some considerations on the use of Pred: about the onset of action, it indicates "1 to 3 months" and the different dosages for in- and out-patients, higher doses to start for inpatients because there is a risk in the initial days…
I share the opinion already given about the Pred scheme you were given…although I could figure out some reason about it: if it works at the beginning and then your condition deteriorate with the taper, that would be a double confirmation for MG but I think (but I'm no neuro…!) it doesn't work that way because the onset of action for an improvement would take longer.
Could you tell us about your symptoms?
Maurice.