Battle Against Depression

I'm currently having a hard time. I'm undergoing depression. I don't know what's wrong with me but I think I lost interest in almost everything. It scares me. I never felt this way before. I feel like I'm waiting for death to arrive. I'm so tired. It's like everything's nonsense to me. I already thought of the worst things that could happen to me. I can't help but cry. All I do is sleep and stay in bed. I'm too lazy and weak to do anything. I am already taking my anti-depressant. I think I should stop being too pessimistic. I don't want this lonliness. It's too painful. All I want is to be back to my old happy self once again. Please pray for me.