Why do I have nausea after drinking or eating?

Every time I take a sip of something to drink, especially water, I get sick to my stomach. I take small sips and that doesn't help. I tried warm water and that doesn't help. My mouth is usually dry and everything I eat taste terrible. What can I do. I followed my post-op diet but eating just the small amounts that I am supposed to eat I am still nauseated, and I feel like I am getting weaker everyday. Can someone help me Please!

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