I was walking my dog several times a day for short distances a few years back when I started experiencing spread to my lower legs--in large part due to wearing the wrong shoes. As, a result, I stopped leaving the house very often.

My energy level had continued to decline, until I recently started taking a D supplement. It seems to be making a difference.

So, you might want to consider either trying to get out into the sun for 10 minutes a day, or taking some D.