Sorry for this loss and the hard time you are going through. Keeping yourself in check is the best thing you can do. Doing whatever won't bring him back nor will it help your cousin deal with it. Sorry if I sound cold, I am not trying to be that way. I have been doing this for almost 3 yrs now and anyone who knows me and has followed me knows I speak from my heart and speak the truth.
Emotional eating is a lot of everyone's problem, once you can control it and learn to deal with it, things get better. Stay positive, things happen for a reason and I believe that with my whole heart. Hugs