<font color="purple"> ((( HUGS ))) - </font> I am sorry for the stress and guilt you are feeling from the death of another and I want to take a moment to second what others have already said...... The death was NOT your fault and there was nothing you could have done about it for the person was an adult.

Please take what time you need to relax and receive some PeAcE back into your life...... and know that the grieving of ones death comes in many ways and forms.
I know this from personal experience as I used to blame myself for my daughters death as she was handicap from birth and I was away on a much needed mental vacation many states away when she was ten years old and became ill and was rushed to the hospital..... I blamed myself for her death for I often felted that she might have survived if I had just been there for I would have noticed that some thing was wrong with her sooner than her care giver did.

.... But now I know that we all have a time to be BORN and a time to DIE and no one can change that.