There is a sense in which certain griefs may never end, depending on your age and the extent of your loss. No, there is no prescribed way to grieve. Many cry and some do not. Many feel very sad and want to talk about it. Others want to deal with it more on their own.
Most people report that their grief comes and goes unpredictably, almost like a roller coaster.
But not everyone reports that. Some people feel worse early on, while others find that their most difficult times come months or sometimes even years afterwards. There are many possible feelings one might have. Sadness, anxiety, anger, guilt, tiredness, helplessness, and loneliness are often reported. Some people feel shame, others feel relief.