I agree with the previous post, you seem to be going down the dehydration route and because you're not eating anything you're not producing enough saliva in your mouth. This could be where your bad taste is coming from. I had this too my first couple of days. It will all get better, just try to drink water, if you're not able to swallow anything then you should really consider calling your surgeon asap. I was told that the stomach could somehow close at the very top and that's when food won't go down. Usually for smokers though. Hope you feel better soon!