It seems from your symptoms that you are suffering from severe gastrointestinal infection
First of all get your stool examined for Routine/Microscopic and for Occult blood.
You should start medical treatment with antibiotic, antiamoebic, probiotic
and antiemetic after consulting your doctor.
You should also take precautions in your eating habbits and eat light food till your condition improves.
Drink pure filtered water. This will help you in prevention of infection.