Non-PRO Hindi to English Art/Literary Poetry & Literature

the passage is about the indian cook, who has regular health problems, and goes to the doctor, but also feels he has to rely on traditional methods:

But outside the clinic he would run into Kesang [a servant] or the cleaner at the hospital or the MetalBox watchman, who would begin to declaim, “Now there is no hope, now you’ll have to do puja, it will cost many thousands of rupees. . . .”
Or: “I knew someone who had exactly what you are describing, never walked again. . . .” By the time he had returned home he would have lost his faith in science and begun to howl: “Hai hai, hamara kya
hoga, hai hai, hamara kya hoga?” And he’d have to go back to the clinic the next day to recover his good sense.

can you please explain what is meant by the expression above?