Please correct my diary

"~since last Saturday" sounds better than "~from last Saturday", but "from.." is also correct.

2. I went to the urgent care at today , just in case.

「病院」といえなら、"urgent care"と代わりに"hospital"と言ってもいいだと思います。

3. As a result , I heard doctor that I had a FLU.

"As a result"はやっぱ変だと思います。「病院に行くなら、検査の結果インフルと言われました」という感じでした。

I heard from the doctor that I had a flu

とか

The results of my (medical) tests say that I have a flu

4. Thus I cannot go to work the company until the end of this week.

仕事 = work

会社 = company

事務所・オフィス = office

You go to work, you go to the office, but only in very specific cases will you have to go to a company

5. I never had been took a FLU in Japan , but took had it for 2 consecutive years in the United States.

Simplest way to say is "I have a flu", you do not "take" a flu, you "take flu medicine" :)

気をつけてください。

1.私は先週土曜より発熱がありました
2.念のため本日病院へ行ってきました
3.検査の結果インフルと言われました
4.依って今週一杯仕事に行く事ができません
5.また日本ではインフルに掛かったことがありませんでしたが、こちらに来て２年連続で掛かってしまった