You can try Guizhi Mahuang Decoction. Its original text is as follows: solar disease, lasting for eight or nine days, is characterized by fever and aversion to cold, with more heat and less cold. People don't vomit and defecate freely. It happens two or three times a day, so they can't sweat less and their bodies will itch. Guizhi Mahuang Bantang is suitable.

4 grams of cassia twig, 3 grams of peony, ginger, fried licorice, ephedra, almond and jujube.

Three bowls of water (about 600ml), and one bowl left (always boiled with low fire for about half an hour), take it immediately. Eat some hot porridge after taking it, don't go out to blow dry, wear thick clothes, and you can take it all day long. If it doesn't work after two hours, take the second dose and try three doses as before.