Clincal depression has been the scourge of humanity for millenia. Mike Wallace talked very frankly about his bouts of depression, especially after the death of his son. Winston Churchill had bouts of depression so well known, he called them his black dog.

Get a full medical check up with fill biochemical work. There are a new generation of medications that can correct the chemical imbalances that are one of the causes of clinical depression, with far fewer side effects than Paxil or other more well known meds.

Good luck and know you are not alone. A good support group or an understanding friend can do wonders in helping you over the rough spots.