See lupus care. Lupus and thyroiditis are autoimmune diseases that can overlap. Each can cause fatigue via different mechanism through inflammation and hormonal changes. Coordinated care by rheumatologist and endocrinologist is advised.
Malaise. Have you been to an endocrinologist to treat the thyroid and the rheumatologist for your sle? The endocrinologist might be able to really do a thorough evaluation to figure out if it is a hormonal or vitamin deficiency contributing.