How to tell if these are signs of depression?

Feeling Good: There are several types of depression. Reactive depression occurs as a result of loss and eventually we adjust. If one does not adjust or if the cause is not clear certainly seek professional help. "feeling good" by david burns is an excellent self-help book based on science. Don't let the thickness of it intimidate you. Take it bit by bit. The very best to you.

Many Signs: Depression can manifest in many ways. Here are the main symptoms: feeling bad about yourself, losing interest in things that used to bring you joy, fatigue, poor concentration, poor self-esteem, guilt, pessimism about the future, wanting to die or hurt oneself in some way, sleep problems, eating problems. A person doesn't need all of the symptoms to be depressed. Consult your doctor to confirm.