Keep thinking that. Things are getting better every day and someday they will figure out how to beat this thing. It is great you are still responding well to
Erbitux - stay strong, there are worse side effects than those!
Keep doing what you need to do and keep dogging your MO to continuously look for outs and options - if something doesn't work, there are still other options, and you are young and strong - you can take a lot yet before you are beaten!
Lotion, lotion, lotion my friend

.
Stay strong!