Oh dear
@Wildflowerlady reading your post has reminded me of dads last days, I am so sorry that your dad is also nearing the end. You sound like you really need to talk to someone but nobody else understands how you are feeling because it's not their dad it's your dad.
Those last days are hard, my dad was completely unaware that he was ill but I was lucky enough to be with him all the time and that helped greatly. You have done so much for your dad and it is clear to everyone that you have acted in his best interests throughout so give yourself a pat on the back because nobody else will. You have shown him love all the way and that's what counts.
My dad's voice got quieter and quieter until it was just a whisper in the end and I couldn't hear what he was saying. I just kept telling him where he was and who was there (me and my husband) and it seemed to reassure him. I don't think you can do much more than that other than tell you love him and talk about some good memories.
I hope you get to see him tomorrow and are able to spend some time with him.
Don't feel guilty because I begged my mum to come and get him on that last morning and I think she heard me. It broke my heart but I also felt a huge relief that it was over for him. My dad also saw people but they didn't bother him.
I don't understand why it has to be like this because it is cruel and unfair. My dad went very peacefully and I am glad of that. I hope it is the same for your dad.
Thinking of you.