I don't think you should add brown sugar to Chinese herbal medicine decoction unless the doctor tells you not to add it casually, because brown sugar is sweet and warm, which has a good auxiliary treatment effect on postpartum deficiency, deficiency of both qi and blood, spleen deficiency and other syndromes, but it is not suitable for syndromes such as excessive heat, excessive fire due to yin deficiency and damp heat, and even causes adverse consequences. Therefore, we should strictly follow the doctor's advice and don't mess around casually, so as not to bring undue losses to our health. I wonder if my answer will satisfy you? I wish you a speedy recovery!