hi and welcome.
well scenario seems to fit typically with gastroeneteritis. you need to take appropriate antibiotics and hydration. fatigue
is because of loss of water and electrolytes eg sodium and potassium . replace them with ORS ( oral rehydrating solution) appropriate antibiotics may include metronidazole( flagyl
) and ciprofloxacin( ciproxin
better do your R/E of stool , if giardia found , a protozoa causing infection with gaseous distension. consult with your physician and if vomiting
is a problem then go to ER to get instant iv hydration. regards