How one passes through these stages and how long an individual will stay or progress from one stage to the next is very individual, and will differ from person to person. However, nearly everyone will experience each stage in some way along his or her journey through the grieving process. Especially if the loss is sudden, a feeling of shock or numbness is usually present initially, which can actually be helpful as it acts as a way to protect one from overwhelming painful feelings. The guilt and feelings of regret may be over things that happened or didn't happen in the relationship, or because you think you could have prevented the death somehow. If your loved one suffered a long illness, a part of you may have some feelings of relief that your loved one has died, and this causes additional feelings of guilt.
Anger is a normal response as well.
Anger that your loved one has died and left you alone, or anger with caregivers for not being able to do more. The feelings of anger can be very strong even when there is not one or thing to blame for the death itself. This is normal too. It's important to be able to admit that the feelings exist and to be able to express the anger in some way. This can be by talking about your anger with family or friends, or even by writing about it in a journal or letter.