How to cope with intense grief and bereavement?

Don't stop reaching out. Trying to ignore your pain or keep it from surfacing just makes it harder in the long run. For true healing, it is necessary to face your grief & actively deal with it. Grief is a roller coaster. Don't let anyone tell you how to feel. Care for your physical health. Express yourself creatively in writing, song or art. Join a support group, find a counselor, keep trying.
Psychotherapy... A significant loss can trigger deep psychological issues and as a result the grief process can turn complicated. In such a case, counseling/psychotherapy is indicated; grief groups can be helpful as well; in some instances, medication might be indicated as well at some point in the process.
Support. Support from family and frends can help one cope with grief. Support groups are also available through hospice and some hospitals. There are also grief counselors who can provide individual counseling.