焦急万分

• have one's heart in one's mouth
• have one's heart in one's boots

例句

1. 她在手术室内动手术时，他焦急万分。
   He was sweating blood while she was in the operating room.
2. 我们焦急万分地等候医生做出诊断。
   We waited in great suspense for the doctor's opinion.