I'm very sorry for your loss. Our emotions play a much bigger part than many of us realize in weight loss and weight gain. If you're not sleeping well or experiencing depression, your body may be "holding onto" fat -and lack of sleep can REALLY be detrimental to weight loss, plus it makes you crave sugar.
I would suggest (if you haven't already) maybe speaking with a counselor to work through your grief process. It may be a good thing for you to take an antidepressant for a few months -that can often also help you lose weight.
It's likely you may not even realize the portions you're eating or what all you're eating, but adding protein and cutting carbs is a very good place to start. Really fill up on fruits and vegetables. REALLY limit grains and try to get away from potatoes completely. White flours and processed foods will make your stomach pooch. Get used to reading all the nutritional labels on food and take notice of the sugar in things. It can be surprising! Eat from the outer edges of your grocery store instead of the aisles where all the processed stuff is.
Google "Lean, healthy recipes" and consider joining Weight Watchers. It's not fast, but it can change your entire approach to food -which you need to do to keep the weight off. It also offers support.
If I lived in a snowy climate, I would snowshoe and cross country ski all the time! Both are incredibly good exercises. Any chance you can start that?