I also think this is reason to contact your surgeon. What about asking him for an anti-nausea drug?
I found I was nauseas sometimes too and I believe it was slight dehydration. So now I start my day off with some kind of liquids... followed by a protein shake for breakfast... followed by more liquids... my total liquids goal before 10:30am is 40 oz. That's almost half of what the daily goal is. This has helped me a lot with nausea... I think because we don't drink for the entire time we sleep, we need to kick in the fluids early in the day. Then I alternate several small meals throughout the day with 8 oz of water. I end up with 64+oz fluids by the end of the day and either 4 or 5 small meals. The amount I can eat at each meal varies. Sometimes I can get in 2T and other times 2-3oz. Sometimes it's the consistency of the food and sometimes I can eat different amounts of the same food. This sleeve I have is sometimes unpredictable, but I'm learning every day. But the restriction is always there... even when my brain says 'eat more!' But I can't.
I also take generic Prilosec first thing in the morning with some water. Almost immediately followed by Phillip's Colon Health (combo probiotic). Both can be a little pricey but worth it to control the acid and keep the good stuff in my lower GI.
I'm really sorry this is hard for you. I can only offer what worked for me. Hang in there!!