Hi. Thanks for your query. Noted the history of severe sickness, throwing up 6-7 times throughout the night, felt flu like in the morning and sharp pains in the lower part of stomach... This may be stomach flu and usually settles on its own and needs treatment for symptomatic and supportive reasons. I would advise you the following: Take a PPI like Omeprazole, Domperidone for nausea and vomiting. Antibiotics if the blood, urine and stool tests show any evidence of infection. Oral re-hydration solution to keep water and electrolyte balance. Consult your Doctor for clinical evaluation and proper management after investigations if necessary.