How can you eat enough and drink enough fluid?

I am 3 weeks post op and get sick to my stomach every now and then. I eat brakfeast and then eat lunch around 12:00pm and then supper around 5:00pm. I am always drinking water between and I always feel thirsty. If I drink after I eat supper, say 45 minutes, I get sick to my stomach. When will I have energy back?? Mary

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