Gulia,
It is very scary to watch someone you love struggling as your father is. Healing requires a lot of rest, so he's probably doing what he needs right now.

Gary mentioned the "pink magic" rinse. There is another that the nurses called, "red, white and blue"--the label colors, that my husband found to be very soothing. These rinses give temporary relief so that your dad could more easily swallow the liquid nutrients. Try whatever works--Delia suggested Instant Breakfast. We also made smoothies in the blender from yogurt, bland fruit like bananas, and protein powder.

Healing IS an uphill battle that seems like it has no end. It's a hard battle and you are helping your dad to fight. It may be several months before he regains much ground. Definitely hire some help if you can and keep coming back to this forum. You will find lots of support here and always good ideas from those who are a little further in their journeys.

I'll be thinking of you,
Charlotte