I'm really sorry to hear your news, but it is good that you have had a chance to let your dad know how you feel about him.
Please don't feel guilty or selfish about your reactions- they are completely natural as you only want what is best for you and yours.
We tend to hear about the negative side of treatment so it is good to hear that the nursing team are caring and considerate.
Please take care of youself and know that you and your family are very much in my thoughts.