I agree that a doctor's visit may be in order. If all checks out well, then you may want to look at your calories. I know if I eat below or above my calories, the weight starts creeping. I also need my daily walk, no matter how fast or slow it may be, everyday. Make sure you are in your range for protein and carbs, too. I know if I'm not in my range, I tend to feel sluggish.
Some days are just tough, but I find tracking daily and posting on the message boards, blogs, and sparkteams helps a lot.
Hang in there
Just take it one day at a time.
|3 Days until: Oklahoma 1/2 Marathon