Welcome to the board Echo!
You certainly have some of the classical symptoms of SAD..the weight gain, overeating, lack of energy, depression. What types of treatments have you tried so far? By far the most successful therapy (for most) is natural light therapy. So, even though you don't WANT to, it's really important that you get yourself outside for a little bit each day....I've heard early morning is best! Exercise can be helpful too, not only to help burn those extra calories you may be taking in, but also because it produces a sort of "high" in many many people. Just try to make it something fun and that gets your heartbeat up a little. I recently joined Curves, and I think it is helping my symptoms a little. It's 3 times a week for 30 minutes, and I can definitely tell a difference in my energy level on the days that I go.
I hope to see you posting again! Maybe together we can figure out a way to make this time of year a little more bearable!
Liz