@brightwings- You must be devastated about your mom's diagnosis. Please don't blame yourself for missing some early signs. This is very normal because as we get older somethings just slips by us. The loss is definitely more devastating for people who do remember.
This group might be of interest to you about your mom, and what you are going through. My mom had Parkinson Disease and she lost her short term memory and then most of her past.
I think that you might be able to get a lot out of this group : https://connect.mayoclinic.org/discussion/eoalzheimers/?orderby=DESC#chv4-comment-stream-header
How are your withdrawal symptoms now that you are home and dealing with your mom?