Heart coronary disease treatment. To be?

It has been 4 years my father suffered from coronary heart disease. We have tried various ways of treatment and consulted some local doctors in my city, Pontianak, Indonesia. It could be said that my father was traumatized by the medicine given by the doctor, because the result was classified as high doses or hard drugs. Now we just depend on herbal remedies in the form of red juice from papua, they call it (kuansu) which has little help my father's condition improved even for a while. Does my father's heart need to be treated with a 'ring' or bypass operation? Some doctors recommend the alternative but it is hard for those of us who have low economic levels. Is there an alternative treatment for coronary heart disease that my father is supposed to be?