I get the part where you get sick of the sweet shakes. I had a tendency to experiment with different foods or shake flavors and then just stick with one I could handle for a week or so. Then I would experiment again, find something else I could deal with and repeat. It just made eating easier. I ate pretty much the same thing every day because I knew I could tolerate that particular thing. All soft boiled eggs one week, all banana shakes the next. I supplemented with boost and carnation instant breakfast.

See if you can mix it up a bit