I am so sorry. I truly understand your fears and pain.
God does not give you anymore than you can handle.........Hold on to that thought.........It was my mantra when I was going through my husband's last weeks....You have gotten through a lot of tough times already.....you can get through this too.
Is it a nurse from hospice that is there everyday or a volunteer? Ask his nurse what she thinks.........they deal with end of life all the time........She can probably give you an educated guess.........they are pretty good at it.
Moonroe.... Worriedgirl and Shelly are absolutely right........Take advantage of the time when you have hospice there........Get in some ME time. You don't have to leave the house or yard to do it. I wore a path around our property when I had people over to be with him. It help to calm me down and think better....
Lot's of thoughts and prayers............