Nocam

I'm answering the Erbitux portion of your post separately from the radiation question. Why? Because the radiation questions have universally accepted factual answers, documented by clinical trials and the laws of physics. But Erbitux is still open to discussion.
Reasonable people can and do disagree on the meaning of the studies done so far on Erbitux. Unquestionably, both the Bonner and the Extreme trials indicate that Erbitux is an effective treatment. Yet it's not clear that it is as good or better than the old platinum drugs. That is why there is a clinical trial being done. It's noble of you to be part of this trial. I am biased against Erbitux since they now know that it does not work at all for up to 5% of oral cancer patients and 40% of colorectal cancer patients but they did not know that back in 2007 when I had it.
Others here did have good experiences with Erbitux , so I'm pretty much the only voice of caution here. it sucks to be the 5% but the odds are with you on Erbitux.
Charm