I felt faint with hunger.

我当时饿得发昏。

《牛津词典》

At the beginning, I managed about once every 3 weeks, and maybe 5 minutes before I felt faint and had to stop.

刚开始时，我尝试每3周做一次，而且可能不到5分钟我就感到虚弱无力，要停下来。

youdao

I have no idea who brought it here, but grandpa did not have a habit of drinking coffee, for he felt the bittering taste had no way to compete with the faint scent of tea.

不知是谁送来的，爷爷却是没有喝咖啡的习惯，在他眼中咖啡苦苦的滋味是怎么也比不了他手中那壶茶的清香。

youdao

Then I felt, across the lower part of my stomach, a first faint ripple of fear.

NEWYORKER: History of a Disturbance