Hi Azza. I think its great that you have not finished the chocolate. Its all about little changes. Because usually the bigger ones do not last. Also, they can have a rebound effect. Causing more weight gain in the end.
The info about the coorelation between Dopamine and carbs was on a video presentation I saw. I got the link through a spiritual/alterative health ( free) teleconference series I subscribe to. Was interesting to watch. Although at the end he did try to sell something. Because of that, I will not put the link here. I would be glad to send the link to you in a pm if you would like. I found it to be informative.
I did, however, find a link that I can post here. Its from livestrong. It talks about Seratonin and Dopamine. The two main foods to help produce high enough levels of both are carbs and protein.
http://www.livestrong.com/article/458140-do-carbohydrates-raise-serotonin-dopamine/ A former naturopath told me that I had to increase my protein intake because my seratonin levels were too low. So I did know about that corelation. I hope to find out more about the dopamine. But it may take a while. I can no longer afford to go to a naturopath.
Keep up the great work. Its a process. Last night I wanted to hit something I was craving carbs so much. But my hands and all surfaces remained in tact. And the carb cravings calmed down. I do think that its important to make sure the protein levels are high enough though.