I refeed from my fasts with pureed vegetable soup. Refeed for me lasts about half the duration of the fast, if I fast 10 days then I refeed for 5. I only get nauseous if I eat foods my body has not recovered enough to consume like heavy oily, processed or sugary/salty foods and if I try to overeat.
I used to get nauseous. Actually I have a lot of health issues that led to a lot of discomfort coming off fasts
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I’ve become experienced and no longer feel bad refeeding and I’d say there’s two things to that:
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Experiment with foods and see what works for you. My wife found fruits that were light (like watermelon) served her best. For me, it was eggs and fibre sources like broccoli or flaxseed. But fruit for example absolutely killed me. Most foods did actually. When you find what works, keep it on your short list. It’ll help you adapt and get to the second point:
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The other thing is as your body gets better at switching between fasted and fed states, all of this slowly dissipates. After 4-5 months I started noticing I could jump in and out of 48h fasts no problem. I now have a schedule of 48h fast, one meal \~2k cals and lots of nutritional variety, then back into 48h. My body doesn’t skip a beat anymore. A far cry from having my stomach turn over a single piece of watermelon or some chicken
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Good luck