H-Ko is exactly right, DBR. If it's your first time doing this, you may find that you need to start over to get the full effects. If it were me, that's what I'd do. The possibility of having to start over again hanging over my head was a major reason I stayed in line on P1!
That, and feeling so good...what happened is a good thing, in that it showed you the major difference in how you feel on plan and off it. Like you, I like it much better on plan, no matter how good things look!
Give yourself until Phase 2 and then you can have chocolate every week!
Until then, learn from the experience and stay away from all M&Ms, okay?
We've all been there, hon. You're back on track, though and you'll do great!