Crying takes the pressure off. Just as a floodgate can save a dam, your tear ducts can allow healing tears to help you get through this time. Don't try to prevent yourself from crying. Telling the story over and over again, to a friend who will listen, a support group or a counselor, may be the most healing thing you can do. Exercise is very important right now.
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Allow yourself as much time as it takes. The grief after a major loss can take several years. You will gradually feel better for longer stretches, but waves of grief will still hit you for a long time. This is normal.