VitaminD deficiency causes chronic tiredness. My levels weren't registering at all when I was tested.
It took massive doses of Vitamin D for six weeks to combat it, but it worked.
If you are really worried, perhaps a GP visit is needed. It could be any number a of things causing it, there is no point in speculating.
I hope you feel better soon.
Has The 'Green Belt' Been Discreetly Abolished?
Ban on mobile phones fur under 16s
Retiring and living frugally in money from downsizing after years of stress



