Thanks for sharing. I'm glad you've managed to pinpoint some triggers and can now understand the reason behind your depression.
I also agree with the gloom that often surrounds Christmas time. My family is overseas this year, and I'm going away with my boyfriend, his mom, his daughter and god-daughter. To a casino resort 600km away - I mean really - not much of a Christmas to really look forward to. 5 days in this resort where there really isn't much other than hotels, a casino and a kids play center; going to have to hope the weather is good so I can lie around the pool