Question

Doctor: what happened to you?
Devang: I am suffering from fever and cold.
Doctor:since when have you been suffering?
Devang: I was feeling unwell since Monday evening.
Indirect speech ​

Answer 1

the doctor asked Devang what has happened to him.

Devan replied that he was suffering from fever and cold.

the doctor asked Devang since when he was suffering.

Devang replied that he was feeling unwell since Monday evening.