My md suspects my fatigue is caused by depression. my vit d level just came back 21.i can't be in sun because of lupus. can this level cause symptoms?

Depression & Vit D: There is some research that suggests low D is linked to depression. Other studies link low D to low immunity. Experts rec D between 50 and 80. Ask your doc about supplementing w/D. Many people need 5K IUs daily. Consider getting some support from a clinical psychologist for your depression. How is your diet--junk food, sugar, lots of carbs? Please avoid. Do you do some moderate exercise?