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As you are unable to hold liquids down and feel dizzy so it suggests low blood pressure,dehydration.
In my opinion,you may require IV fluids and injectable anti-emetic medications,anti-spasmodic medications.
If your current doctor is not responding to you so you should visit ER.
It can be intestinal parasitic infection,Colitis,Bacterial gastroenteritis.
Even if we consider it flu however main concern is to prevent dehydration from persistent vomiting.
I shouldn't advise you OTC medications because you can't tolerate it as you are not holding water.
If you are unable to visit ER then let me know further.
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