Bad Days Turn Into Bad Weeks

I think I said before that I'm participating in a biggest loser style thing online, but this will be the second week that I'm in last place, for sure.  I keep taking things day by day, but then the bad days turn into bad weeks and months and then it's been almost two years of really, really hard stuff going on.  How come I was able to eat well when I was pregnant and now I can't seem to get it together?