Solange Knowles has revealed that she was diagnosed with three chronic illnesses in 2018. The 38-year-old musician explained that she has POTS (postural orthostatic tachycardia syndrome), MCAS (mast cell activation syndrome) and Sjögren’s syndrome, a long-term autoimmune disease that primarily affects the body’s exocrine glands. Responding to an Instagram post from Shaun Ross, the model and musician, who shared about his own experience with POTS and Long COVID, Solange wrote: “Sending u so much love and strength Shaun and to all in the comments struggling with the debilitating, confusing, and …