During medical treatments this summer I had extreme nausea. Needed to drink 2-3 liters of water every morning before treatment. Got to where I couldn't keep the water down. A real problem. Marinol worked for a short time, then didn't. Hadn't smoked since 85. Was gifted an assortment of buds/strains and Mj did it for me, instant nausea cure. Had an appetite too.
What I found was that coffee really upset my stomach. Tea was fine. And my diet, what I could tolerate, changed to real mild stuff that I liked. Oatmeal, banana's, toast, rice, rice milk. For me a combination of no coffee, mild food, and a whiff of weed cured the medically induced nausea. Drinking that much water first thing in the morning still sucked but I could do it. Also found I felt (more fluid), smoother, some way better, with that much water in my system. Getting some kind of calorie's in me for breakfast helped too.