just caught up on all this....poor toby..
He is probably shivering because he has a temperature, keep on pushing those fluids even if its only by spoon/syringe....
i wouldnt offer him any food at the minute(he probably wouldnt take it anyway)....and maybe when the diawotsits tail off a little plain boiled rice...
i really hope poor tobes feels better very soon, its so worrying when they are poorly xxxxx