1. Mom: Despite my effort to correct my delinquent son's behavior, he became worse and he started doing drugs. I am so mentally exhausted.2. Psychiatrist: I am sorry to hear that. Let me see what I can do.
 mentally exhausted mentally exhaustingmentally exhausted 就是心裡非常勞累的意思，也就是心力交瘁的意思
All the work I've been putting into this project has been all fo nothing because my boss is shutting it down.