Sorry for your loss. It's hard to lose a loved one and it's easy in those moments to eat for comfort or to numb the pain. I gained a lot of weight after I lost my dad too. I thought, life is too short, let me enjoy the pleasure of eating, but then I wasn't feeling good about my body. So I stopped and started paying attention to my weight and finding some other ways to grief. You can lose weight without exercising. There is a saying :" You lose weight in the kitchen, you get fit at the gym." You can do this!