I feel for you RavenWolf.
One of my triggers is the colder weather and winter starting and the loss of daylight, our temps dropped yesterday and the cold set me off. I woke up feeling so bad, thought I wasn't going to make it to work. I took extra vitamins and on my lunch break I went outside and sat in the direct sunlight for 20 mins. It did help, but I am dreading this winter as I have been moved out of an office I had for many years that had a huge window and plenty of light thru the winters. I am now in a dark cubicle in a room with no windows. I was moved last fall and had the worst winter I have had in 13 years. I almost lost my job because I would get so depressed I couldn't function. I also work long hours and usually it is dark when I drive to work and dark when I drive home. My large office window was the only thing that kept me from going over the edge. I am trying to convince my self that my new commitment to losing weight and getting healthier is going to keep my going, I have also gave up alcohol so hoping that will help too since that usually just makes one more depressed. You have come along way in your weight loss, I admire that you have stuck with it. Don't let that nasty darkness win.