I have a stomach ache in vienna on travel what should i do?

Depends on severity: Evaluation is warranted if severe, progressive, or persistent. More information (regarding the timing, location, contributants (e.g. taking NSAID's, alcohol, diet indiscretion), exposure risks, predisposing factors (like peptic disease, stress) may help us better target an answer for you.

Visit farmacia: Excellent pharmacies are available all through Europe and many can prescribe their version of U.S. OTC medications; however, if stomach pain is severe, seek immediate medical attention.