Hi, Mariam,
I am a caregiver to my husband and although things weren't as difficult as they were for you, it was really, really, really tough. It is a brutal treatment for most who go through it. The helplessness I have felt so many times as I see his pain, confusion, and frustration, plus the sense of loss I've had over missing my energetic, outgoing husband as he has spent weeks being nearly silent (but mucousy) - have added to this difficult treatment. I don't really know how any of us could be completely prepared as each treatment varies and unexpected things happen.
I am so glad that you and your father have become closer. Plus, I think it is a gift that you were able to lovingly help your dad through the mucuous, spit, vomit, etc. Not everyone could do that. I am glad that your dad's treatment is over and you can focus on the next stage. (recovery is difficult but several weeks out I have seen great improvement).
I will be thinking of you and your dad - Sophie