There are several stages to memory loss.
I do not believe I can accurately describe the different feelings and experiences properly to anyone that has not experienced losing their memory.
Stage 1
Bliss
During the first stage, the person with memory loss with forget about upsetting events from the week before, or even the day before. It is very easy to lack the ability to stay mad at someone, and this later leads to repetitive arguments over the same subject. While in the bliss stage, a person can forget about finances, life goals, relationships, and responsibilities and simply be "happy" unaware of the chaos around them.
Stage 2
Confusion
During the second stage, a person can easily become confused about why certain things have taken place, some due to the bliss stage. For example, during the bliss stage, they might have neglected to pay the electric bill, or it could be as simple as talking to someone about something, and not remembering it later. This can become a large problem if the person has made promises, fallen in "love," or started a life change, like school or work. Confusion can lead to the nest stages, which happen periodically in no particular order.
Stage 3 and 4
Loss of Emotions / Overload of Emotions
The most recent stages to me, as I am sure there will be more, are very tolling on a person. At times, a person will be completely void of emotions, and then at other times, very upset and frustrated when things don't work out. This stage is very similar to manic/depression, but should not be classified as the same thing. The sudden lack of emotions is more like an empty feeling of, well, no feelings.
I'll continue more on this later when I reach more stages. Hopefully I will be able to explain them at that point.
