lack of appetite

In August I was diagnosed with NSCLC. It is also in my bones, 2 lymph nodes and I have lesions on my brain.  I have already had full brain radiation and also radiation to the tops of my femurs. I'm getting an MRI this week so we will know how well the brain radiation worked.  I started Tarceva in September and during the past few weeks I have lost my appetite.  Nothing tastes good.  I am able to drink Ensure, but I'm getting bored and want food.  I am a 48 year-old mother of 3 and I need to keep eating!  Does anybody have any suggestions?