You have signs of dehydration
Thanks for your query,based on the facts that you have posted it appears that you have diarrhoea and vomiting for about 3-4 days due to food poisoning or may be due to Gastroenteritis
and have noticed dryness of the mouth and skin.
You have signs of dehydration due to sudden loss of fluids and need to consult qualified General Physician and get following basic tests done.
1) Routine Urine test
2) Serum Electrolytes
3) Stool Examination.
In the mean while take combination of Ofloxacin with Tinidazole
along with antacids like Pantaprozole twice daily.
Ensure to take oral rehydration drugs like Electral which is available in powder form .This will help to restore electrolyte imbalance
that develops due to diarrhoea and vomiting.
Ensure to drink more water to see that you pass minimum 1000 ml of urine in 24 hours.
Take soft diet
till your diarrhoea is well controlled.
Hope I have answered your query ,please feel free to ask if you have more questions ,I shall be happy to help you
Thanks and Regards.