Congrats on the loss...are you feeling better? I think that's the best part of P1...how good you feel by the end! (you obviously don't feel that great at the beginning...
Ruth has just the right advice about P2. However, to do a successful P2, I'd finish doing P1 for at least 3 days...as long as it takes to make sure you have no cravings from the ice cream cake. Okay? If you go into P2 with cravings, you won't do well and you'll be frustrated with yourself. So stick with P1 until all cravings are gone. It can take from 3 to 5 days to get the sugar out of your system again.