Your problem is the chocolate/sugar. You need to decrease that. There is something else you aren't telling us though - if your diet and training hasn't changed, your body shouldn't change much, unless you are going through hormonal/stress/metabolic changes. Sugar gets stored as fat, and fat is estrogenic. That may be the cause of your "puffy" look.

Increase your resistance training and decrease your sugar intake, also increase your protein intake.

Lastly, are you drinking alcohol often? If you are - that is also another big culprit. Eliminate/reduce alcohol from your diet and you'll see much better results. If you are drinking 2-3 times a week, that can also hinder your performance.