Hi Paul, I do not know much about Cambodian's health service, but the management of Crohn's is an important factor not to get yourself into trouble in the mid and long term with this unfortunately chronic disease.
What has your doctor told you about medication for your case? Whereever you want to live in Cambodia would have to have a gastroentereologist who knows about Crohn's. At least this is my view. Of course, it would be a lot easier if you already know a lot about Crohn's, what drugs work for you, that you can keep in remission with a certain diet etc. But I understand you were just diagnosed, so it might be hard to effectively manage it. Do you have a lot of symptoms? Are there any immediate problems you have (narrowings in the intestine, fistulas, mineral deficiencies etc.?).