Red, I started to read these forums and soaking up information about a month before my start date. I found that it not only gave me information and lots of useful tips but that I actually couldn't wait for my start date to come around.
I'd planned my start date to be at a reasonable time so that I could compensate for any ill feelings and nothing going on for a couple of weeks on the social calendar.
You didn't share what your 'bad' day actually was so it is tricky to help much further because it could have been a straight forward bad day as far as dieting was concerned or a bad day in your life issues which made you fall off the wagon. Both have different responses on how to jump off your rollercoaster and only you can tell us what your rollercoaster is 'the diet' or 'life feelings'
So when is your NEW start date? We are all here for you.
Lisa x