Brief Answer:
You are having Enteritis.

Detailed Answer:
Hello,
Thanks for choosing HealthcareMagic for your query.
Have gone through your details and i appreciate your concerns.

Gastroenteritis, also commonly referred to as infectious diarrhoea, is a gastric disorder. The gastrointestinal tract, which comprises of the small intestine and stomach gets inflamed. Gastroenteritis is indicated by the symptoms such as diarrhea, acute vomiting and pain in the abdomen. Fever, exhaustion and dehydration are also observed. This disease usually lasts not more than two weeks. It is also called the stomach flu. Infections caused by virus, bacteria, parasites or fungi may lead to gastroenteritis. Viruses account for this disease the most. This disease is transmitted mainly from food items and contaminated water. Important electrolytes like sodium and potassium are lost from our body.

Green color may be due to bile pigment in the stool because diarrhea moves food too quickly thorough the intestine so the intestinal chemicals and bacteria can't break down the bile pigment to its normal brown color.

Treatment-

Drink plenty of fluids to avoid dehydration–You need to drink more than usual to replace the fluids lost from vomiting and diarrhoea. Water is best, but you could also try fruit juice and soup.
Take Tylenoll for any fever or aches and pains.
Get plenty of rest.
If you feel like eating, try small amounts of plain foods, such as soup, rice, pasta and bread.
Use special rehydration drinks made from sachets electral solution to maintain depleted electrolyte levels in serum.
Take anti-vomiting medication (such as zofran 4 mg twice ) and antidiarrhoeal medication (such as Imodium(loperamide)upto 16 mg a day) .
its better to take 3 days antibiotic and anti protozoal course.
Tab ciprofloxacin 500 mg twice a day(9a.m-9 p.m)
Tab Metronidazole 400 mg twice daily(9a.m-9p.m)

You would need a prescription.

Test suggested
Stool test

Thanks!

---