From "Prayer Faith and Healing"  Alzheimer's And Developmental Disabilities-Well Balanced Mondays   

80% of caregivers of Alzheimer's patients experience high stress levels and more than half experience depression. 20% admit to being in fear of hurting a parent due to frustration. Those with the disease through time, Pg156 : " experience memory loss, and a worsening ability to think, understand, or make decisions, they also commonly exhibit agitation, aggression, and depression and are likely to wander as the disease progresses."