What causes upper stomach pain, nausea, loose stools, fatigue, and gas with vomiting?

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The symptoms that you mentioned are consistent with acute gastroenteritis. Please follow the following diet, take the following medicines and do the following investigation.

Diet: BRAT diet which is short for banana, white rice, apple sauce and white toast (bread). Stop eating all vegetables and fruits except bananas and potatoes. Drink ample fluid. Avoid dairy products, caffeine drinks, spicy food, food from outside, fried food, sweets. You can eat poultry or meat but cooked blandly. When you start to get better, introduce normal diet bit by bit.