My mother is 90 with dementia and this past month or two she has insisted she is in another house. We had been able to reason with her that she had been in this house for over 50 years. This week she has called other people to tell them she had moved to another town incase they wanted to know. She is calling several times a day wanting to go home. Can another medical condition cause this or is it just the dementia getting this much worse? She is on Namenda and has been for several years.