I've been really down in the pits before, gained weight, been really bad, and worst thing I can do is think I'm not worthy or that I have nothing to add for others. This is definitely not the case, and further we all need the warmth and support of everyone else. We cannot do it alone -and fortunately we don't have to! We need you just as much as you need us. Other Sparkers have kept me from despairing many times. Keep coming back, even if you might feel like you're complaining or not doing your best - it may be part of your process that you need to do to get where you want to be.
I like to think, even if I'm not doing a good job, I'm doing something - even if it's just reading what others have to say. We all have to start somewhere.