My only advice would be to see your doctor. Only he will be able to tell you if it is depression, or perhaps something else.
I've been dealing with it for awhile, then it got to the point it was being pointed out to me, that I must be depressed. Saw my doctor, and he said I was pretty bad..
Perhaps, if I saw my doctor sooner, rather than later, I could have got help before I got this 'bad'
Hang in there