Im experiencing constant watery green diarrhea, frequent burping that taste like rotten eggs, abdominal bloating and gas, all after eating a burger.

GERD: You may have gastroesophogeal reflux disease (gerd), with an upset stomach as well. Certainly avoid trigger foods high in fat-like the burger and try increasing fluids and taking an over the counter acid blocking medications such as Prilosec with maalox. Eventually, this is a warning sign that you need a good GI evaluation to get properly diagnosed. Best wishes.

Flu Season: During flu season the stomach flu is very common. Also, infections such as from food can cause these symptoms. Given that your symptoms came after eating a meal that could have had undercooked meat i would see how you feel tomorrow before contacting the doctor. That is, unless you do not get worse symptoms.