Melissa, so sorry that you are at this point with your Bear. He is blessed to have you by his side.
My Randy passed away at home. Hospice was in and out the last 5 days that he was in a coma but they did not stick around for hours. I don't think that they operate that way. They got me in touch with a home health nurse that I hired to spend the last two nights of his life with us. We both slept in the room with him but she was in charge of the meds so I could get at least a little rest.
So if you think that you would like more help, ask hospice about a home health nurse. I told her that she was a Godsend as she was experienced and exactly what I needed to get me through the last little bit.
Yes, it is so hard to watch them go. I hope your Bear's passing is peaceful, but if it isn't (like Randy's was not), you will get through it and at least you are there for him. He is probably not feeling anything at this point so all the strain is on you. I talked to Randy nonstop when he was in his coma--a running commentary. If I left the room I told him where I was going and when I expected to be back. I put on old home videos so he could hear the sounds of the voices of his loved ones (like his mom who had passed away).
God bless you. I hope you get the help you need, Sally