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.（ 女士回答男士的话，说她感觉不舒服，而且这已经有一段时间了，她还感觉嗓子疼，但她否认有发烧或者头疼的症状。）
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.（ 女士回答上个星期持续熬夜，并且每天都只睡四、五个小时。可知这引发了疾病。）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（男士建议女士好好休息并且多喝水，并没有给她开药。）
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?