He feels headache, nausea and vomiting.

　　他覺得頭痛、惡心和想吐。

　　He is under the weather.

　　他不舒服，生病了。

　　He began to feel unusually tired.

　　他感到反常的疲倦？

　　He feels light-headed.

　　他覺得頭暈。

　　She has been shut-in for a few days.

　　她生病在家幾天了。

　　Her head is pounding.

　　她頭痛。

　　His symptoms include loss of appetite, weight loss, excessive fatigue, fever and chills.

　　他的癥狀有食欲和體重減輕、非常疲倦、發燒和發冷。