H! My Mom was diagnosed with stage IV colon cancer met to liver and passed away slightly less than a year later last October adn then my Dad was diagnosed with Appendiceal cancer with spread to his abdomen in Febrruary and I am a childhood leukemia survivor, so unfortunately I have a lot of experience with chemo!
First check with your doctor and make sure it is not progression of disease or a blockage that is causing these symptoms. At the end for my Mom, she could not eat or drink. My dad had an issue with that it was a blockage and is now doing better.
Check with your doctor and see if you can take Pepcid for the reflux... less harsh that the other stuff. Try a ginger pill twice a day for nausea. See if doctor will prescribe Decadron, it is a steroid that increases appetite. My Dad goes on Decadron pilss three days following chemo treatments and has definitely helped.
Sometimes it is very spicy or very sour food that may work as well. For me and my Mom, we had to have tomato sauce! Dad seems to really like Mac and Cheese, French Fries and Kentucky Fried Chickem... we joke that it is strangely greasy food what he craves, can handle and taste. It is a lot of trying things! HE also likes those Nilla Wafers and tons of Jello (although Jello has little as far as nutrient and calories, it at least gets him fluid)! I also bought a snow cone machine that helps with fluid intake!
To keep weight on my Mom we used the Carnation Instant Breakfast with Heavy Whipping Cream and Whole milk and then added chocolate syrup (if chocolate flavor) or Strawberry Quick (if strawberry or vanilla flavor) to kick up the calories, we had her drink to 1000 calories and she got down two a day... the doctors were amazed we kept all the weight on her!
Peanutbutter is a great source of calories and good fat too.
Have your husband try sucking on sour candies to stimulate his taste buds.
It is hard to force things on them. I remember when I was sick... it is hard as the caregiver to put yourself in the place of the sick patient and how they fill. I was in the hospital four months straight when I was sick and the first month I wanted no light or TV, it made me nauseaous. It is a very hard place top be, the patient or the caregiver. I am sorry so many of us go through this and no one truly understands until you are faced with the situation. Sometimes I think it is harder being the caregiver than when I was the patient because you feel so helpless and you so want to take away the pain and hurt and can't. Hang in there and just try tons of different things and let us know how you are doing!