I find that with each day removed from the treatment, my digestive system improves, but I take it slow, eating small portions throughout the day, and also 2 bottles of Boost between meals for protein and weight gain. Folferinox is very strong stuff, and it takes a while to build back strength to tolerate the next cycle. My oncologist gave me an extra week to recover in this cycle to make sure I am ok for the next round. I hope your dad feels better.