Dear Kim,
I am sorry to hear this. Like Marions husband, my dads vomiting increased over time. He tried a variety and type of medications for this with varying amounts of success. You are right in that making your dad as comfortable as possible is so important here and I know that you and your brother will do this for him. I too was my dads carer and I know what you are going through right now. Hospice care will be a big help to you all right now if that is available and they helped my dad so much, and I am sure that they would also be of great help to your dad. We are all here for you.
Thinking of you right now,
Gavin