Not sure if these have already been posted or discussed, but:
From Julie Stachowiak, Ph.D. , your Guide to Multiple Sclerosis
It is common for people to refer to "a senior moment" or say something like "must be my Alzheimer's disease" when they forget a name or an appointment. I never really thought that was particularly sensitive or funny, since Alzheimer's is real and debilitating.
However, since my own MS-related cognitive dysfunction has led to situations where I am truly befuddled or at a complete loss for words, I REALLY don't think the Alzheimer's reference is funny at all - actually, these moments are often extremely distressing and have given me a great deal of empathy for people experiencing dementia of different types, including Alzheimer's disease.
Sooner or later, most of us who have experienced MS-related cognitive dysfunction do start to wonder if it will continue to progress, how far it will go and how it is different from Alzheimer's disease. Many of us (I know I did) also wonder if our MS gives us a propensity to develop Alzheimer's disease later in life.
I have put together some articles to try and answer some of these questions. I hope you find them informative and comforting.
http://ms.about.com/od/multiplesclerosis101/f/alzheimers_ms_link.htm?nl=1
http://ms.about.com/od/signssymptoms/f/ms_cog_dys_and_alzheimers.htm?nl=1
http://ms.about.com/od/signssymptoms/a/cognitive_over.htm?nl=1