I would recommend the Christian Hospital in Silom street. A few years ago I sent a Thai friend there, he suffered from "Youth Arthritis which was extremely painful. He could not afford a "real" doctor and had to rely on the "30 Bhat treatment". The doctor at the Christian hospital came to the right diagnosis , he really cared about my friend, checked his blood etc. and gave the right medicine. I showed the doctor s paper to a friend of mine...the boss of a famous hospital.. when I was back in Europe and he told me he would have chosen the same treatment like the Thai doctor. I think the bill was around 4000B , blood check and medicine includeded