Hi,
Welcome to health care magic,
Diarrhea with vomiting without fever,nausea may be infective,(
gastroenteritis) or food poisoning or drug induced or
food allergy but it should be treated by urgent medical attention.
It can also be related to allergic to some food but we can say only after complete clinical examination of those rashes and various lab allergic testing.
So,you should undergo routine blood investigations,allergic testing and serum electrolytes,liver and kidney function tests,
urinalysis and stool for routine microscopy and abdominal
ultrasound to detect the underlying cause.
So you will require
oral antibiotics with fluid and electrolyte replacement therapy to maintain fluid and electrolyte balance.
Consult your family physician or allergic specialist and visit to ER immediately for complete treatment.
Thanks and regards,