write a thank-you letter

Dear Mrs.Smith,
I'd like you to know that the days we spent together last week is the most interesting time I have never been through in my life.Therefore,I really appreciate the food you cooked for me,and the kind conversation what you made me felt relax and refreshed.
I must confess that I was quite depressed before I went to your house.After your kindly feast,I felt tomorrow would be a brand new day for me.I just want you know that how much I am greatful for what you did.
Sincerely yours,
Diana Ho
我自己乱编了点什么吃饭之类的,不然这个信写不长,我用的时态我检查过了,基本没错,不要全改成现代时或者过去时,祝你学习愉快.