Grief is a natural response to losing someone that is important in your life. Coping with the loss of someone or something you love is one of life’s biggest challenges, however, it's an inevitable process. Sometimes the emotional pain can be so overwhelming that it may affect your daily functioning, emotionally and physically. There is no definite answer to the question"how to deal with grief?" because everyone has their own way on grieving. However, I would encourage you to talk to people you trust; take care of yourself in terms of physical and emotional health, and immediately seek emotional support from family and friends if the feelings are too overwhelming. Some people may heal as time goes on, but some may not and it is okay to feel not okay. You may seek consultations from mental health professionals if the problem persists and it has affected your daily life functioning.
Hope this helps.