EDIT: It looks like a cross between parts of Africa and China where Ive been. Alot of your food stories seem similar as well, I hope you had something like immodium.
Nope, it's almost unobtainable. There is almost no medicine in the entire country. Over-the-counter stuff like immodium or Tylenol or even aspirin is nearly impossible to get. She did find me something that worked, but it took a special trip to the "Pharmacie".
Did the McDonalds join other fast food outlets like pizza hut and KFC?
No, thank god, there are no fast food places in Cambodia that I saw. The closest thing was the Lucky Seven, but no McDonalds, No Pizza Hut, Wendys, etc. None.