A、She didn’t have enough sleep. B、She has caught a bad cold. C、She is dying from a serious disease. D、She is too nervous to feel

M: Hello, Miss. What brings you here today?
W:(13)I am not feeling myself. This has been going on for days, and I have a sore throat.
M: Don’t worry. Let me have a check. Do you have a fever or headache?
W: No. But I’m afraid I felt a little dizzy when I got up this morning.
M: Well, open wide and say "Aaa".
W: Aaa.
M: Eh, your throat looks a little red. Let me check your tongue... Mmm, it seems okay.
W: Doctor, what’s the matter with me?
M: Well, there is nothing serious, and you needn’t worry. Now tell me, did you sleep late recently?
W: To tell you the truth,(14)I stayed up very late last week and only slept four or five hours every night. My term paper was crushing the vitality out of me. I tried my best to prepare for it.
M: That may explain something. You are wearing yourself out.(15)Now what you should do is have a good rest and drink more water.
W: That’s all? I thought you would give me a lot of medicine and ask me to stay in bed for a couple of days. Thank heavens! I almost thought I was dying!
M: You really needn’t worry. Just take care of your bedtime. Lacking of sleep can lead a lot of problems. You don’t want to be ill during the summer vacation, do you?
W: Of course not. Thank you so much. Goodbye!
M: Bye.
Questions 13 to 15 are based on the conversation you have just heard.
13. What is wrong with the woman?
14. Why does the woman feel ill?
15. What does the man suggest the woman to do?