Hello, My Daughter Is Being Treated By A Doctor For

Hello, My daughter is being treated by a doctor for hypothyroidism (1 grain daily), low iron and 2 strains of yeast - Candida albicans and Rhodotorula mucilaginosa in her gut. She has been on Nystatin for 2 weeks and says she still has stomach discomfort constantly and for the last 5 days has been having constant headaches. He is telling her that she needs additional blood work to test her liver -- that the headaches may be a result of her liver not processing the toxins/die-off of the yeast. He is also ordering a comprehensive blood panel. My daughter is 19 and attending college and is under a tremendous amount of stress just trying to keep up with all the meds and school, plus play college tennis. Do you think the headaches are a result of the yeast die-off or the Westhroid that she is taking?