Hi Judy.. sounds like your having a rough trot with the nausea. I know what you mean about the protein powder I hate taking it but I'm only 3 weeks post op and can't get anywhere near the correct amount unless I take it.
I have heard that the nausea does get better but maybe someone on this site has had the same and could advise you better. For water and fluids remember jelly and icey poles just sucking on them is good I have lemonade flavoured Bulla one low cal etc. Also if you like the lipton peach or green tea, I mean the cold ones that come in a plastic bottle, they have a lite version and my dietician said I could have those to break the boredom. I also have sugar free gatorade type of drink (sorry can't remember the name) on hot days just to hydrate me I love the blackcurrant one. I hope you feel better soon.