Help please! is depression a serious thing?

Yes: Some people have died because their depression has become so severe that they no longer want to live (i.e. Suicide). Not all people with depression get this bad, thankfully, but when someone experiences symptoms including very sad mood, loss of interest in pleasurable things, weight loss/gain feelings of hopelessness, irritability, loss of appetite it's time to get professional help.

Depression: Absolutely, depression influences all aspects of life and if left untreated can destroy an otherwise productive life.