I'm going through the same thing - a sudden weight gain around Xmas - which is explainable - which won't come off - a little harder to explain.

I've reduced carbs, reduced calories, and upped exercise, which has resulted in maybe a 1-2 pound loss since Dec 27. Having said that, I usually do gain a few pounds in the winter refuse to budge until spring. I don't know whether it's "winter blahs" or if it's just easier to exercise when the weather is better.

You obviously don't live in my part of the world - 2 1/2 weeks without sunshine? That ain't nothin'. Some years, we go months ... and it is DREARY. Very depressing. I'm sure it slows people's metabolisms.

Hang in there!

Rachel