New onset Nausea

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Just wondering if anyone else has had this problem.... I had surgery on 12/3 (roux en y). After surgery I was drinking nectar sweets mixed with milk without difficulty for my protein shake. All of a sudden this week I started getting SUPER nauseated with them. I mix them with milk, but dairy isn't the problem. I drink plain milk without difficulty. I've tried them with almond milk with the same result. Has anyone else developed an intolerance to something that they were previously fine with? It happened more than once, so it wasn't a fluke. Abdominal pain and severe nausea that resolved after about 30 minutes.