Margaret,
When I've traveled out of the country (US to Mexico/Central America). I've brought 2, 250 mL Solucortef Actovials, needles, a letter from my doctor giving me permission to carry an injection kit, instructions on how to give a shot, Zofran, extra HC, Immodium and Pepto-Bismol. I'm a puker so I wanted to make sure I could handle as much as possible on my own if there was a chance that I might have to go to a hospital. I had no issues during travel though.
Vietnam sounds exciting!
I'd be interested to hear what others do for travel.
:) Dusty