Hi,
I suffer with depression and lethargy which is definately brought about by the weather,lack of light.
I recently purchased a Lumie Lamp, which has lifted my mood no end.
I agree it could be Seasonal Affective Disorder (SAD). Losing your baby could also be a contributing factor. Have heard they have lights that make a room look like the sun is shining when it's not. Even have baseball hats with these lights that you can wear outside if it's a dull, gray day.
Sounds like classical Seasonal Affective Disorder (SAD). This is a mood disorder when depressive symptoms begin in winter and fade when spring rolls around. Light therapy during winter seems to work well for a lot of people. I would do some reasearch and see a professional counselor/psychologist who will be able to help with treatment options.
Good luck,
Em