Answer:
Definitely not being able to see your loved ones in your last moments.
Step-by-step explanation:
When you're nearing death and on your death bed, you generally want people you know and love to be there so you can say your last goodbyes and say how much you loved them, and so they can do the same for you. However, if there's nobody there in your last moments, it's just this feeling of loneliness and sadness as you pass on.
My opinion on this answer:
In my opinion, that's one of the things I'm scared of. One of my fears is being alone, and if that ever happened to me I feel like my last few moments of living would be filled with tears.