Well i have been depressed many times in my life.Its something that our body does to alarm us that we need to change our lifestyle and move forward.Most of the time it starts with panic attacks or generalized panic disorder.There's a lot to say about this subject but the most general advice i would like to give you is to consult a psychologist that specializes in Cognitive Behavior Therapy.This is the most successful way to fight these symptoms.No matter how strong we are,we need some guidance in very complex situation like depression.The sooner you find someone that could help you,the easier would it be for you.