【例句一】
There's something wrong with my stomach.
我胃不太舒服。

【例句二】
There's something wrong with my leg.
我腿不太舒服。

Not feel like oneself
不太像自己/状态不好

【例句】
I don't feel like myself today probably because I didn't have my coffee.
我感觉我今天不在状态，可能是因为我还没喝咖啡呢。

Not feel so hot
感觉不太舒服

【例句】
I don't feel so hot. I think I might be sick.
我感觉不太舒服，我觉得我可能病了。

Under the weather
感觉不舒服

【例句】
She's a bit under the weather today so she can't come to work.
她今天不太舒服，所以不能来上班。

Feel unwell
感觉不舒服

【例句】
He's been feeling unwell all week.
他这一周都感觉不太舒服。

Bedridden [ˈbɛdˌrɪdn:]
（因为生病）无法起床

【例句】
Jack was bedridden all day after a night of heavy drinking.
Jack昨晚喝大了之后在床上躺了一天。

Feel funny
感觉怪怪的

【例句】
I feel funny. What's in this drink?
我感觉怪怪的，这酒里有什么？

Not here
心不在焉，魂不守舍，不在状态

【例句】
I'm not all here today. I didn't get enough sleep last night.
我今天有点儿不在状态，我昨晚没睡够。

① I'm not here.
我心不在焉。

② He is not here.
他魂不守舍。