Here's the completed dialogue:
A: You look tired. You should lie down (lie down),
B: I know. I feel terrible. Shall I see (I / see) the doctor?
A: Don't be silly! Do you have a temperature?
B: No, I don't.
A: Then you shouldn't go (not go) to the doctor. You're just tired. You should sleep (sleep) in bed.
B: OK. Can you phone Mark? He shouldn't visit (not visit) me today.
A: OK. Should he call
B: Yes. Thanks. You're a good friend.