I think that it sounds like a good idea just to use today's plan and forgive yourself for taking care of yourself today. I haven't really figured out a way to stop from slipping when things get stressful. I know if I have a plan it helps but doesn't always work perfectly somedays but it helps. Best wishes.
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Bipolar I, Depression, GAD Meds: Zoloft, Zyprexa, Ritalin
"Each morning we are born again. What we do today is what matters most." -Buddha