How to get out of my funk?

I love being healthy and working out so why have I been having such a hard time lately?

I have completely dropped out of the Daily Sparker March challenges for no reason.
I get bitter when I turn down cake at a staff birthday lunch, whic makes no sense because I don't even like cake!
I am constantly switching out a apple as a snack for chocolate
I haven't been excited to hit the gym like normal

I am just feeling like my whole life has been out of whack these past two weeks. I don't know if it is just work stress that is creeping over into my whole life or what. I just really am feeling like I want a friend to talk to right now about how hard everything has been feeling. I want them to remind me of why this is all important and to listen to me. :o(