He shouldn't be having any side effects from radiation this early - has he already started chemo also? If no chemo, I would talk to the MO about antianxiety meds. What you are describing sounds more like a reaction to Cisplatin or other chemo drug. Most of us don't have side effects from radiation until at least 3 weeks and most of the time the nausea is from the ct. Cooking odors made me nauseated as well - it's pretty common. It's usually worse the closer to the ct infusion. There were days that it didn't bother me so just check in with him. Mild nausea can be managed with Ativan as well.

In my post Tx phase I suspected that I had some nausea issues from the radiation but I was so screwed up by then who could tell?!?!

Is is not only heartbreaking to watch someone go through this but you will often feel helpless as well. Get some help for yourself - caregiving is very tough business.