Hi thanks for asking question.
First try to avoid stress as it can precipitate your diarrhea.
There is no worry in visiting gastric surgeon.
Noted you have watery diarrhea..You have to first examination your stool.
Stool may show eggs or trophozoites of parasitres that suggest
parasitic infection of gastrointestinal tract.Treated with
metronidazole or albendazole according to causative parasites.
Do you have mucous in stool?? If present search for
inflammatory bowel disease.Endoscopy can be useful.
Rule out thyroid problem hyperthyroid , HIV like disease as it can lead diarrhea for prolong duration.
Endoscopy done and biopsy taken from suspicious are might reveal
microscopic colitis or
lymphocytic colitis.
Meanwhile follow below instruction....
-Avoid smoke
-Avoid alcohol
-Avoid excess spicy food
-Avoid fatty and fried foot for few days
-Drink more water to maintain hydration
-Green leafy veg gradually can be started
If still bacteria infection strongly suspected then stool culture can be done and treated accordingly with intravenous antibiotic if needed.
Wish you good health.