First, medication: generally, you can take Liuwei Dihuang Pill, and take Zhibai Dihuang Pill for severe deficiency of fire.
Second, diet therapy: eat more foods that nourish yin and reduce fire, such as kelp, seaweed, spinach, brown sugar, pumpkin, tremella and so on.
Third, taboo: 1) abstinence from sexual life, generally yin deficiency and fire are caused by yin essence loss. (2) Do not eat warm and dry fruits and condiments, such as litchi, longan, durian, mango, star anise, pepper, cinnamon, etc., and do not eat greasy foods such as high fat and high calorie. (3) No stimulating drinks such as coffee.