I am very sad to hear of your situation. I know the overwhelming sense of loss you feel, having been widowed myself at a fairly early age. It takes a long time to assimilate such a huge loss and it never goes away, though in time you learn to live with it more peacefully and the time comes when the good memories stop being a source of pain and loss and become a comfort, a source of private treasure that you visit and re-experience. It did take me a long time to reach that stage, and before that I seemed to go around in circles and cycles of grief that were unpredictable and often overwhelming. I did find new happiness eventually.
I am very sorry for your loss and offer my sincere and heartfelt condolences.