Ask if your cancer center does molecular/genetic tumor testing. That will show your particular mutations and can help determine future treatments. I'm assuming you've already had your KRAS tested since you're on Erbitux. Other genetic tests you should have include: BRAF, MLH1, MSH2, APC, MSH6, PMS2, and MUTYH.
Additionally, testing for MSI or MRI status (MLH1, MSH2, MSH6, PMS2) lends information for the option to use pembrolizumab (Keytruda), a PD-1 inhibitor, and part of a new set of exciting immunotherapy drugs that are coming out right now. I'd also ask about Nivolumab (Opdivo), another immunotherapy drug, which is available for MSI-H or mismatch repair deficient (dMMR) patients. Again, the key is finding out your cancer genomics so you know which one is best for you.
I know it's hard not to freak out right now, but there are lots of new immunotherapy drugs coming out. Plus things like TIL immunotherapy at NCI, which our own Celine went through with great success. Hang in there! Stay strong and come up with a plan!
Stage IV, liver/lung mets 8/4/2010
Xelox+Avastin 8/18/10 to 10/21/11
LAR, liver resec, HAI pump 11/11
Double lung surgery + ileo reversal 2/12
Adjuvant Xeloda 3-9/12
VATS rt. lung 12/21/12 - benign granuloma!
NED 3/17/12 to 12/13/2017, CEA<1