I am very sorry about your husband's diagnosis and the challenges you are both facing. My husband was diagnosed with small cell ca in Jan. 2005. It had spread to his bones, but not to other organs. The chemo and radiation will take the desire to eat away. I had to constantly urge my husband to eat. I gave him high calorie foods, milkshakes, Ensure, etc. I also kept bottles of water in the freezer, because he prefered very cold water. It also had to be bottled water, as he complained about the taste of tap water, which had been fine, prior to chemo treatments.

The strong painkiller medicines, especially oxycontin can cause confusion. Once, when the dose of oxycontin was too high, my husband did not even know who I was. After lowering the dose, he was back to normal thinking, but did sometimes claim to see butterflies, etc. and this was in the winter!
I know this is very hard for you to go through. Treasure each day that you have together, and tell him all the things you want to say, now. Contact hospice, they can give you literature and tell you what to expect.