回肠九转 (huí cháng jiǔ zhuǎn): Extreme anxiety — Meaning & Stroke Order

Missing his distant family, he was in anguish every day and could not sleep at night.

At the moment of parting, she was so heartbroken that she could not speak.

That farewell letter caused her such anguish that she couldn't calm down for a long time.

The poet used 'huí cháng jiǔ zhuǎn' to describe the sorrow of parting.