Ennui

Somehow, I thought when the weather cooled off a bit, I'd be more energetic. This is not proving to be the case.
There are so many projects I should be taking up now, and I'm not doing any of them.
In addition, I've put back on 30 of the 50 lbs I lost two-three years ago, and that probably is not helping the situation at all. Ugh.
The question is, how can I self motivate to get the ball rolling? Once I'm on the move, I tend to keep going for at least a while. Momentum works. Where can one find it?