I'm not a doctor, but your symptoms could suggest that you may be experiencing a gastrointestinal issue, such as a stomach virus, food poisoning, or possibly something like gastritis. Symptoms like stomach pain, vomiting, and diarrhea can happen for various reasons, including infections, dietary indiscretions, or even stress.
If your symptoms persist, worsen, or if you're unable to keep fluids down, it's important to seek medical attention. Staying hydrated is crucial, so try to sip clear fluids if you can. Please consult a healthcare professional for an accurate diagnosis and appropriate treatment.