Loss of a loved one is painful. Pain that lasts a long time. It's not that you will forget, but you will learn to tolerate the pain and move on with your life. Losing a loved one causes a grieving that many have a hard time understanding unless they have lost a loved one themselves. It is not uncommon to feel alone, sad, have insomnia, lack of interest, tearfulness, not wanting to participate in your own life. Talk it through with a professional therapist.