Hi, Welcome to health care magic, Severe stomach pain,loss of appetite,diarrhea with sore throat and other all symptoms may be indicative of infective,(gastroenteritis) with upper respiratory infection but it should be treated promptly before some serious problem starts to arise. Also,you should be further evaluated by clinical examination and various tests. So,you should immediately undergo routine blood investigations and serum electrolytes,liver and kidney function tests,urinalysis and stool for routine microscopy and abdominal ultrasound to detect the underlying cause. You should take immodium (loperamide) which only reduces excess water content in intestine but must be taken under strict physician s supervision. So you will require injectable antibiotics,anti-inflammatory,anti-emetics,probiotics with fluid and electrolyte replacement therapy like intravenous fluids and antibiotics injections immediately. Better to avoid smoking and also alcohol (if you take) during the treatment course.Also avoid adderall medicine or take only after your doctor s advise. Consult your local physician or visit to ER immediately for complete treatment. Thanks and regards,