I am so sorry to hear you are sick in Vietnam. Its bad enough when we get ill in private, let alone when there's noplace to go.
I just had this happen to me on a trip to Italy last month - I was in the Imperial Forum with my boyfriend and ooops, a horrible accident I couldnt avoid. It was 90 degree heat, and a 20 minute walk to the bus stop, and a half hour ride back to the hotel. I cried the whole way. My advice to you, besides doing the best you can to take care of yourself, is to be prepared just in case. Bring a bag in case you have to throw up, wear depends, bring wipes and a change of clothes and hand sanitizer. An extra bag in case you need to throw anything out. hopefully the bus driver will stop for you if needed but it will be more comfrting if you are prerpared for the worst.
Hopefully you wont need any of these things, but I only wish I had toted around a little backpack with 'chronie necessities' on my trip. Would have save me a lot of embarrasment.
As for the meds - I'd call your doctor before doing anything - this new doctor doesnt know your history as well and you'll get the best advice from your regular doctor.
Best of luck to you.
Diagnosed with UC 8 years ago
Asacol / 12 per day
Canasa / 1 per day
Rowasa / 1 per day
Prednizone / 40 MG Day( finished taper!!!)
Azathioprine / 100 MG Day
Levaquin 1 per day
Flogyl 1 per day
Diagnosed with Crohn's 6/26/2007