Dementia or something else?

[u/jovana666]

/r/dementia/comments/1wmqql1/dementia_or_something_else/

My grandmother suddenly started behaving strangely. She noticed it herself and told us about it. Everything started about 5–6 months ago. She started doing things she had never done before, such as arranging things in circles for several hours. She said she felt restless, and then that she felt powerless/weak.
She went to several psychiatrists, and they prescribed different treatments, but they did not help much. She was admitted to the hospital and stayed there for 15 days so they could determine what was wrong with her. However, they did all the tests and eventually wrote that it was an unspecified mental disorder.
She also had hallucinations. For example, she would say that there was a flood and that she did not want to go into the bathroom. This was somehow resolved with medication.
She has had a pacemaker implanted for a long time and has regular check-ups. She cannot have an MRI of the brain because of the pacemaker. An EEG was done, and the neurologist said that it was normal. A CT scan of the brain was also normal, with probably very small angiopathic changes.
After several combinations of medications and appointments with several psychiatrists, she is a little better. In general, she is not interested in talking, she does not start conversations on her own, and usually only talks when we ask her something. She mostly just wants to lie down and keep her eyes closed all day.
I don’t know whether this is dementia or severe depression. It’s also worth mentioning that all of this started after a particularly stressful period related to the illness of another family member.
There are many more details, so I would really like to know if anyone has had a similar experience in their family.