I found that just taking a small sip of liquid, often helped. All that tasted good to me was Crystal Lite sunrise (a orange flavor)
My suggestion is keep trying different flavors, and try adding a little to your Water.Try some herbal tea if you have it, just slightly warm, not hot. I had to have everything watered down for awhile. Every day should get easier for you. Good at doing the walking. You may also find sitting up even if for brief periods of time may help you also. I also had some issues, then a few days from surgery I started to feel human again. Hang in there.
I hope this helps you some.