The amputee will tend to have a wide variety of emotions including anger and depression. The grief is natural and unavoidable. There will also be a tendency for a reoccurrence of grief emotions in a lesser degree at a later time, sometimes years later. Amputation is a tragedy. But, the person is the same person before and after the amputation.
Life is still worth living after amputation.
To combat the feelings of grief, the amputee may benefit from professional counseling and mental health doctors. Note that the combination of physical and mental trauma of amputation can actually create chemical imbalances in the body that impede mental recovery. These imbalances can be treated with prescriptions from mental health doctors. Once out of the hospital environment the amputee has to face the real world. As with any personal problems a person might have, some people react better than others.