帮我修改一下英语作文,有问题语病的地方请指出来,

帮我修改一下英语作文,有问题语病的地方请指出来,
I was really sad there days.I have problems and they are serious.I need your help.
My best friend leaved for Shanghai two days ago.I always missed her.I want to call her up bur I did not her telephone number.So I can not liaison with her.What should I do?
Then we talk about another problem.In my birthday.My father buys an expensive Swiss watch for me.But I do not know that where my watch is.I look for everywhere.I lost my watch.I was really sad.I can not visualize if my father know it.It was terrible!Oh,what should I do?Can you help me?
一个有关于自己的问题的作文,哪里有语病或者不恰当的地方请给予修改,
第三行第一个单词不是 BUR 是 BUT ,后面是 did not konw.