when one is dying a slow death do they see the Angel of death the whole time or at the last moment?
According to Islam the angel of death comes at the last moment,whether it is a slow or sudden death.....

ive heard things like the person knows is awarethat they'll die soon bu cant but cant,or are not able to tell anyone or act upon it (by doing alot of good deeds)..
Two possible cases when a person knows they will die :
1-A person going to a battle,war,risky voyage.
2- A person to have a dream could be interpreted as a death coming to him,her or to someone else..
True dreams are of so much importance to ,actually according to Albukhari Hadith it is a kind of inspiration by Allah ...
I believe strongly that and had lots of interesting experiences with dreams that came true according to its iterpretation:
once I had a dream that I was walking and stopped looking at my right hand ,suddenly found one of my fingers (the smallest) is cut and absent from my hand !!!!!
when I wake up I thought too much,what such dream means?!!
I asked my grandfather (May Allah bless his grave),for help ,and we try to interpret the dream.....
He told me the key word for that the number 5 .... and added ,either this dreams mean that a family or group of five ,you know ,lost one !!!!!
I told him ,I know no group like that ....
he said ..well Do yo pray consonantly all the 5 prayers?
I told him except one prayer !!!!! all the last month ever prayed it !!!!
I understood him and was amazed ,really Allah inspired me with such dream and it is a kind of blame of my fault regarding the prayer no.5 !!!!!
another interesting dream ,once I was away from Allah ...not praying at all .....and lead a bad life
I had the following dream lots of time at the same week...
the dream was that I was lost in strange land and was walking on my hands like the clown !!!!
such repeated dream made me think lots !!!!
one day I was listening to the Quran o Radio and a verse stopped my mind
[Mulk 67:22] So is one who walks inverted upon his face more rightly guided, or one who walks evenly on a Straight Way?
the verse made the dream clear for me and I felt ashamed of myself and repent ...!!!
another common dreams used to have:
1- the gnawing of teeth means a trouble you will have (I had such dream and came true all the time i had it!!!)
2- If you walk on muddy place and you got you feet or body dirty.....it is a big sin you will commit.
3- if you see a man without moustach (in real life) have one in the dream ,then this man should have sinned..
4-watermelon is a bad thing to see.
5- losing tooth is losing one of the family or a dear friend.
and many others I don't recall now....
all such dreams i used to have and always the same results....
sorry for such personal post ,I usually post my posts with academic material,but I just felt to talk personal ,as I feel here I'm among real brothers and sisters in our great LI ..
May Allah bless all