If you honestly think that talking out your problems is "stupid" then you will always be an emotional eater. Can't push your feelings down by trying to soothe yourself with chocolate. Feelings win every time. If you can't be honest, vulnerable, and sensitive with your partner, then this is something that will never be solved. If you quit sugar, you'll just move to alcohol or cigarettes or both. Accept that your feelings are valid and don't let your partner discredit them as "stupid" and just tell your partner that even if they don't see eye to eye with you about your feelings, it would make you feel better getting it off your chest than have it fester and force you into an eating disorder.

Something worth looking at so you can understand why we need to allow ourselves to be vulnerable: Brene Brown's video about vulnerability on Ted Talks. http://www.ted.com/talks/brene_brown_on_vulnerability.html

How do you overcome the sugar addiction though? You convince yourself that you don't deserve a reward until the conflict is resolved. The problem isn't the sugar. The problem is why you feel you deserve one without earning it.