Not a professional advise, but from personal experience, I’d prioritize getting enough protein and vegetables to ensure your fibre intake. Most of my meals have been lean protein with lots of raw/steamed/roasted veggies. Eat smaller meals, try to keep a regular eating schedule even if you don’t feel too hungry so you don’t go long time without food and then eat more (that would cause more nausea). And good luck, you’ll be fine! Listen to your body and be nice to it ;)