Dittos to what the others have said. To try to answer your question - no, you don't have to start over. There really isn't anything magic about Induction - it is mostly psychological. Atkins even admits that in a sidehanded sorta way if a few places. Just start following your low-carb guidelines at whatever level you want to start at - and Induction levels are perfectly fine if that's what you want. I wouldn't worry too much about limiting yourself to the foods on the Induction list, but I would suggest you limit yourself to the foods you were last eating until you are re-established so that you minimize the risk of inadvertently eating something that, for you, is a stall food that you didn't already know about. Plenty of time to find that out later.

Good luck and Keep the Faith!