Hello, I can understand your concern for newly developed symptoms. I can guide you for your GI symptoms. 1) No, there is no need to shorten your trip. Antibiotic treatment will work. 2) Your symptoms are due to gastritis (severe inflammation to stomach) which produce upper abdominal pain, nausea and vomiting episodes. 3) Main part of treatment is prevention of dehydration which might develop due to severe vomiting. Drinking of ORS powder mixed water is recommended. If this also make you to vomit then you might require IV fluid support. 4) Other medications include - specific antibiotics, anti-spasmodic group of medication to relieve abdominal cramps, anti-acidity medications. 5) You should consult local physician for diagnosis and to start appropriate treatment. Hope I answered your query. If you have any further query, I would be happy to help you. Have a good day!