Hi. Thanks for your query. Noted the history of diarrhea, nausea, throat pain, loosing sleep, taken pepto bismol, and miralax. Stop miralax as you already have diarrhea. All the symptoms are suggestive of a possibility of gastroenteritis with GERD. I would suggest you the following: PPI like Omeprazole, antacid, Domperidone to control nausea; an antibiotic if infection is suspected or evident on tests of stool, urine and blood. Supportive and symptomatic treatment as may be necessary and control of foods and beverages that cause problems. Consult your Doctor for clinical evaluation, examination and treatment.