One of my aunts has vas dem. We found she recognised us and could speak to us almost right up to the end. A lot of what she said made no sense at the end,but some of it did.
She had a series of small strokes, but was able to move about and eat/drink by herself.
In the end,she suddenly was unable to walk,stopped eating,then stopped drinking. Auntie did not appear to be in any pain,and this final bit only took a month.
Obviously this varies a lot from person to person,but this aunts illness was much easier to cope with than her sister'. Her sister had a diagnosis of Alz disease.
Please try and take one day at a time,hoping things will not be too hard on you