I think you  should also think about your diet. If you have any broblem with you health you should take all neccersary pills with you.
Anyway when I came to China I was sure that I'm completly healthy. But after 1 year serious troubles began so I had to come back.. I've spend 1 year and thousands of dollars to improve the health status, but now I still have some problems with my stomach.. So now I advice everyone to take care about their diet and choose only healthy products! You are what you eat.