My doc's office sells products from Health Wise. They had a Protein mix for drinks so it was thinner than a shake and were fruit flavors. While I didn't thoroughly enjoy them they were easier to get down some times and they had 15g of protein per 8 oz of Water. Stuff ain't cheap, but it helped me get through the early stages.
Are you mixing your shakes with milk? I know water isn't all that appealing to some people, but mixing it that way might make it go down a bit easier. I had to sacrifice protein for water intake the first few days until it got easier to drink my shakes.