Eric was born in a rural town in the Midwest. He made average grades in school and decided after graduation to purchase a farm in the area and raise corn. He enjoyed this lifestyle and did quite well. One day, while working in the field, Eric was seriously injured in an accident with the combine and he was rushed to the hospital. The doctors were able to save his life, but his legs had to be amputated. Eric is now confined to a wheelchair. It has been a year since the accident, and he still takes morphine (which his doctor prescribed) to control his considerable pain. His thinking remains quite rational, and he has been able to do some work helping with the books at his parents' store. He does not enjoy the work, however, and misses his previous activity. Recently, he confided in his doctor that he does not feel that his new life is worth living, and he has decided that he would like to end it all.

What is their possible mental disorder? Explain. What is a possible treatment?