I can't stop eating chocolate

I don't know what is with me. I think because I am tired, and a bit down that I keep eating chocolate. I'm looking for comfort because I feel so crappy so I eat some chocolate. Wait let me rephrase that... I have an unending, insatiable craving for chocolate that doesn't seem to ever go away. So I have some but I still feel crappy and then I feel crappy about myself because I eat it and am going to gain weight and am not feeding myself right so I figure oh well I'll just have one more piece maybe it will make me feel better and the whole cycle starts again. What is wrong with me how do I stop this? Why do I feel this need to eat chocolate to compensate for the tiredness and low-self esteem I am feeling. I guess I'm in a bad chocolate place right now. Help....