All are normal. All can resolve. Mourning is considered complete when memories of your beloved no longer evoke painful feelings and are instead replaced by a sense of acceptance. Many factors impact the resolution of grief, such as the age at the time of death, and circumstance. Unresolved issues in a relationship often create a more difficult experience of letting go.
Emotions are energy.
Often our tendency is to not allow the feelings to fully surface and thus the energy becomes held or stuck in the body. Consciously allowing the feelings to be what they are and feeling them fully is what allows them to release and transform.