Dear Mary:
I'm sorry to hear that you are sick.Here are some advices for you.
You should drink a lot of water and have a good rest.If you still feel bad,you should see a doctor.You shouldn't go to bed very late or work too hard.You will get tired and feel more uncomfortable.
I hope you will be healthy soon.
Yours,
Kate
可能有错误,因为我没学过这课抱歉