Yogip, I can only speak to radiation side efx, and for me it took a good couple of weeks before things started to go south. I hope your father's doctors are helping him treat the pain and nausea. Don't hesitate to ask them and/or bug them about this!

Courage to you both.
David 2

David 2
SCC of occult origin 1/09 (age 55)| Stage III TXN1M0 | HPV 16+, non-smoker, moderate drinker | Modified radical neck dissection 3/09 | 31 days IMRT finished 6/09 | Hit 15 years all clear in 6/24 | Radiation Fibrosis Syndrome kicked in a few years after treatment and has been progressing since | Prostate cancer diagnosis 10/18