feel nauseous
In German, the phrase 'sich übel fühlen' is used to express the feeling of nausea or queasiness. The word 'übel' means 'badly' or 'ill', and 'sich fühlen' translates to 'to feel'. So, 'sich übel fühlen' literally means 'to feel badly' or 'to feel ill'. This phrase can be used in a variety of contexts, such as when someone is feeling sick after eating something that didn't agree with them, or when they're feeling carsick or seasick.
I feel sick because I ate too much.
This sentence is indicating a cause-and-effect relationship, where the excess food consumption caused the speaker to feel sick.
He feels sick after hearing the news.
In this sentence, the speaker switches the subject to a different person, indicating that this person became sick after hearing some presumably negative news.
If you feel sick, you should rather stay at home.
This sentence is giving advice to the listener. If the listener is feeling sick, the speaker is advising them to stay at home.