He feels headache, nausea and vomiting.
他觉得头痛、恶心和想吐。
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.
他觉得头晕。
She has been shut-in for a few days.
她生病在家几天了。
Her head is pounding.
她头痛。
His symptoms include loss of appetite, weight loss, excessive fatigue, fever and chills.
他的症状有食欲和体重减轻、非常疲倦、发烧和发冷。