I had the exact same diagnosis in 9/08. After all the tests I was started on gemzar and tarceva. I had really bad side effects. Everything from diahrea to sores all over my body and zero appetite. I think most of that was the Tarceva. After a couple of rounds I had another scan and it wasn't working. In fact, it was worse. I was then started on 5FU and Leukovarin. My serious side effects cleared up. I was fatigued and had mouth sores but nothing I couldn't handle. After a few rounds all my tumors had shrunk.
All of this to say that if one treatment doesn't work, there are many others to try. I'm now playing golf 2-4 times a week and generally feeling good after 8 months. I thought I would be gone by now.
I'm not cured, I'm just hanging in as long as I can. I think attitude and a lot of prayers from other have helped. I also think the antidepressant I was prescribed has helped considerably. I had lost 35-40 pounds due to lack of appitite. The antidepressant (Paxil) has increased my appitite and I've gained all that weight back.
Hope this helps some. Best wishes. Never give up!