Kindly refer to the following link(s):

I fear the pain of death

Signs of a good ending

Fear of Death (positive fear VS. negative fear) | Sheikh Assim Al Hakeem

How to cope with the exaggerated fear of death? pos neg fear

If the soul of a believer is taken out in a peaceful way, why did Prophet suffer in his last hours?

How to deal with anxiety regarding health or fear of death? (Belief in qadr / predestination