Take an OTC lactobacillus preparation (probiotics) and yoghurt with your meals. Drink plenty
of fluids (clear soups,
water, ORS
in water, lemonade). Eat light, do not stay hungry but eat simple things like toast, porridge, cereals, crackers, banana, rice, peeled apple, etc. Take over the counter antacid and antiemetic (this SOS for vomiting). Watch out for a day or two with this treatment. If it does not help, consult a doctor.