My dad had a total gastrectomy in oct 2011 and had follow up chemo due to having eosphogal cancer. In the last few weeks he has developed severe back pain and stomach cramps along with being sick after some foods - however soups he can tolerate. Any advice would be great!
Chemotherapy causes nausea and vomiting as a side effect by destroying the lining of the digestive system. This lining regenerates after the chemotherapy is stopped but during it, these side effects are common. You need to do 2 things. First take anti-vomiting Chat Doctor.  Since his appetite will be down, try finding foods that he tolerates or likes and increase their amount and supplement them with vitamins and protein powders. He will like sour foods better than sweet or salty. As to the back pain, it can only be decreased by taking pain killers. Tab Paracetamol 1g thrice daily should suffice.