I think Maxwel asked some very important questions. We can share our experiences, but they may be quite different than what you are going through.
As for me, I was suffering terribly from losing my life from Rheumatoid Arthritis, and between the pain and loneliness, I became depressed and turned my back on God.
God was faithful, and after 2 years of sulking, he told me to read the Psalms. It took a while, but I finally picked up my Bible again and read 5 psalms a day for 2 years. I found hurting people who cried out to God. I also found them praising God no matter what. God then called me to seminary, and now I am a pastor, my ministry is to those who are hurting and broken.
I would suggest that you just sit down and read the Psalms over daily, for a start. Of course, you may need medical attention, spiritual or psychological counseling, or other things. One thing I do know, it is very hard to get over depression without some kind of help. And the longer you wait to get help, the worse the depression will become and the harder it is to get over.
So, see your doctor and your pastor immediately. There are so many people waiting to help you. Although your situation may seem hopeless, it is amazing what getting the right help can do to change this downward direction you are headed in. Posting here is a good first step. Please take the next steps!