When denial can no longer be maintained, likely replacements are anger, rage, envy, and resentment. God is a typical target of anger, especially in cases of death or natural disasters such as floods, drought, or fire. Anyone who the person thinks could have prevented this situation, such as doctors or family members, are also targets of the distressed person's anger. The person may also resent those affected less severely than he or she. It's also a normal, and not necessarily bad stage as long as the person does not destructively act out his or her anger against him- or herself or others or remain stuck in this mode.
Anger coming out of deep loss is different from occasional day to day flare-ups.
It may be helpful to get away from the situation for awhile to calm down or find some constructive way to work the anger out of your system. Then return and take some positive step towards the problem. Talk about your feelings but avoid blaming others. Blaming fuels anger and may result in violent actions. Anger is often a secondary emotion.