A few days ago, I was extremely upset.

几天前，我十分烦心。

youdao

I'm extremely upset about her illness.

她的病令我非常不安。

youdao

The difference between the extremely happy people and extremely unhappy people is not that one gets sad, of upset, or anxious, or depressed; and the other does not.

极其快乐的人和极其不快乐的人,区别不是在于一个会伤心，难过，焦虑或抑郁;,而另一个不会。

哈佛公开课 - 幸福课课程节选

He seemed extremely upset and didn't appear to want to talk, she said.

CNN: Boy killed in Boston blast wrote, 'No more hurting people'

One of Wendleton's clients, a financial services executive, phoned her last week extremely upset because she'd been let go.

FORBES: Magazine Article

Staff at a pet shop in Liverpool have been left "extremely upset" after a large lizard was stolen during a burglary, police have said.

BBC: Black-throated monitor lizard