I am so sorry for your loss, truly I am.
When I lost my mom a few years ago, the only thing that prevented me from going over the deep-end, so to speak, was exercise. I'm not kidding.
It literally saved my life. I felt so out-of-control that I felt this was the one thing that I could control - the way my body looked. I don't know if this helps or not but food is definitely not the answer. My heart goes out to you because I know EXACTLY how you feel. My prayers are with you and your family at this difficult time.