29 weeks on day 3 of stomach virus. Help

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Currently 29 weeks and have been so sick shaking, horrible stomach pain, nausea, fever, headache, sleepiness, out of it, diarrhea, weak. I'm on day 3 and fever has eezed up but the stomach pains are so unbearable. Even a sip of water kills my stomach. I haven't eaten in 3 days and have lost 5 pounds. I'm worried about my baby and not sure what to do. I went to the hospital 2 days ago and they just gave me fluids and tylinol. I'm worse then I was when I originally went in.