Welcome to HCM,
It seems that you are having Acute Gastroenteritis
causing all these symptoms.
Immediately attend ER as there are all chances to have dehydration
Due to nausea
you wont be able to take more water and from excessive loose motions loss of water is fast leading to dehydration.
Try to have more water, electrolytes and liquids.
Take curd, rice and buttermilk, coffee.
Ok and bye.