I'm really sorry to hear this, losing my partner is one of my greatest fears. As others have said time is a healer but you should really invest in some self care if you want to move forward (not necessarily on). Have a drink sure, but if you are drinking more than you did 3 years ago you should really rain it in. Don't neglect your diet, get out walking (audiobook on your phone so you are not just with your thoughts), 4-7-8 or box breathing (look them up) get a routine and stick to it, find an activity that tires you out physically so all your energy isn't focused on thinking.
Drinking will only slow the healing process, you can be sad (there isn't anyone who wouldn't be) but don't neglect yourself, I'm sure you know what is a sensible limit. You need professional help and if you are thinking about turning to drink you should let them know, they will be able to help I can guarentee.