So sorry for your loss OP. Are you having grief counselling?
Drink isn't ever the answer and drinking on an empty stomach deliberately sounds like masochism really, you wouldn't want to fall into a habit, which is a worry if you are already feeling there is 'nothing' else that helps you manage your feelings and if you feel you should isolate during sadness.
Obviously everyone is different but I would go for a brisk walk, make a deliberate point of noting down anything nice you see- dogs, signs of spring, nice houses,blue skies etc. Sounds glib but can be helpful and compiling information is a great way to realign the brain. Find a recipe and cook yourself a wholesome meal instead of wine.
During grief (after the initial constant devastation) I found it helped to set a time on crying if I felt I just needed a cry. Let it all out for 10 minutes, accept it, feel it, then stop and make yourself do something else. Ultimately if things are so bad you can't motivate yourself OP, what you need really are your friends/family to do that for you so I'd recommend that you try to take up offers, or ask to see people even if your snap response is that it doesn't appeal.
Looking after yourself means that you are investing in anything that you can do that will have a cumulative positive effect on your good mood even if it feels shit- walks, good diet, company, talking therapy, setting time aside to cry or indulge a positive memory- not giving in to destructive, isolating patterns that will make this worse in the long run. Grief is such a pit that we often end up treating ourselves as though we hate ourselves, because the feeling is so negative and painful inwardly that our outward behaviour reflects it. You're loved OP, must show yourself love, the love your DM would want you to show yourself in an ideal world.
for you OP, it's very hard and I do hope I haven't sounded glib. It is all easier said than done, but small steps make a journey.