Suggest Treatment For Stomach Ulcer, Severe Gastritis, Intermittent Diarrhea, Severe Stomach Pain And Burning Sensation During Defecation

Hi , I had stomach ulcer still and i had unprotected oral sex before 13 days , and i developed severe gastritis, also sometimes diarrhoea now from yesterday severe stomach pain ,unable to lying downwards, burning running stools looks like red , unable to eat normal food pattern , stomach burning . my stomach is paining and frequently being uneasy what happen to my stomach?