What causes pain in the lower abdomen, toooo much gass after eating and white coated tongue after a month of antibiotic use? endoscopy and hpylori checked and resulted negative?

Post antibiotics: You may be dealing with antibiotic associated diarrhea from a change in the makeup of your intestinal bacterial population. Avoid harsh roughage in your diet, take probiotics which your pharmacist can recommend and take kaopectate or Imodium if you're experiencing too many bowel movements. Your mouth may have a yeast infection. Your pharmacist or MD can recommend appropriate treatment for this.