sprpatterson, chemotherapy damages the melanin cells and can change the color which usually returns to normal after a year plus. The drugs also damage the hair follicles and can change texture. My cousin's curly hair became straight. After 18 months the hair became curly again.
I haven't tried any of this but biotin and vitamin d might help. You are probably already careful about getting enough protein. Massaging your scalp would increase blood flow and should help, maybe imperceptibly.