Why did you faint?

In the previous chapter, we read that Dr. David, the psychologist, explained Robert's condition and advised that:

Dr. David: In simple words, he is not ready to remember all the memory that he has lost, so I advise you not to let him overthink anything whatever the circumstances are

Mr. Henry: Ok! Doc we will be more careful now

Dr. David: So! I am giving you some prescriptions and Robert will get conscious after an hour and then you can take him home

Mr. Henry: Ok!

Then everyone left the room, Mr. Henry went to buy the medicines, and Mrs. Henry was in a state of worry and shock while Robin consoled Mrs. Henry and Mike. After an hour Robert gained consciousness. Everyone went to him, Robin said:

Robin: What happened back there, Robert? Why did you faint?

Robert: I fainted? What...

Mr. Henry: Honey! Nothing happened!

Mr. Henry glared at Robin and he realized his mistake:

Robert: Then why I am in the hospital?