I do think light therapy will help so will speak to G.P about it. I do have severely low VitD for which I get regular injections every 3 months & also take daily supplements. I've had a couple of horrendous days... DD been ill vomiting, bro dislocated shoulder & me feeling like crap!!! wonderful times
Certainly this time of year can be bad, particularly this year for so many where we are getting mostly grey wet days with low light levels rather than the bright crisp autumn days that we can get. I think this year is going to be particularly challenging for people because of the poor summer.
I have an SAD light that I use over breakfast. it might also be worth supplementing with vitamin D which the body usually synthesises from sunlight. I agree with going to see your gp, sooner rather than later as we are at the beginning of winter and there's no point in going through winter feeling so rubbish if you can be helped.
yes, it can. check out: "Seasonal affective disorder (SAD), also known as winter depression, winter blues, summer depression, summer blues, or seasonal depression"
you should ask your gp about about light therapy - you can purchase a special lamp called light box, the brightness and colour temperature of light from a light box are quite similar to daylight and can help with lifting your mood
my SIL gets quite down in January, partially to big dip after all the Xmas cheer, partially coz its so dark and seems so long till spring! I actually used to hate 1st Jan, I'd say that is the single most depressing day of the year.