Welcome Donna:
Like you, I felt as if my life was over the day they told me I had LC. Then my instinct of self-survival kicked in. I told my son that I wasn't going to lie down for this disease.
Also dx'd as III-B, and inoperable, I went through the chemo and radiation. I never missed a day at work, although it felt like I was dragging a couple of hundred pounds of dead weight. My energy started returning once chemo was finished. The treatments knocked the cancer out of the lympth node and has stablized the lung tumor.
Bottom line ... my life is not over; it's just changed. I've gotten a tremendous amount of hope from the experiences of everyone on this web site. I pray you do too.