I have recently been in talks regarding Vit D supplements for school children. Studies are showing that there is a marked increase in rickets in some cohorts of children. I have seen some of the symptoms in some children myself.
Vitamin D Deficiency | Health | Patient UK
You may also suffer from Seasonal Affected Disorder (SAD). I do believe there is a type of phototherapy lamp that sufferers use in the winter months.
Seasonal affective disorder - Wikipedia, the free encyclopedia
Hope this helps and hope you soon feel better.
