I am sorry to hear about your wife, I hope she her treatment will be successful. I have been working in oncology for the past six months, and the question you have asked i find very difficult to answer. the reply i have to many of my patients is everybody reacts differently to treatment. Today there are many treatment for NHL and what to expect can be very individual. You must ask the nurses on the ward to provide you with some sort of information, perhaps there will also be a possibility for you to speak to a psycologist, this can help to give perspective to help you and your wife to get throught this difficult time. G-d bless and Best wishes