Hi Doc I Have Stomach Ache After Eating Outside Spicy

Hi doc I have stomach ache after eating outside spicy food ........ Last time I had this I visited a doctor and he prescribed Sompraz d40 for 3 days and it was cured ....... But now again I was out for job and had to take food outside and same problem surfaced again..... How long shall I take Sompraz d40 to completely cure and It doesn't come up again. Is Sompraz d40 safe to take for longer period.