Check it, please.

I am writing to complain about your restaurant "Fairy", which I visited 2 day two days (We try to describe small numbers using words.)ago. I ordered the fried potato, grilled from chicken fillet and a glass of tomato juice. All The food was very delicious and I was satisfied. I felt off and a I had a severe stomachache very was ill, when I came home. I caused called an ambulance, and the doctors said that my condition it was due to food poisoning.

The doctors advised said me to remain in the hospital till I had completely recovered and complete course treatment. I was very sad after receiving this news. Maybe was Perhaps I have consumed contaminated food poisoned (If you say that someone poisoned you, it means someone was intentionally trying to harm you by giving you poison. However, when we use the phrase "food poisoning", it just means that the food was contaminated with bacteria or virus.) in your restaurant. If I were you, I had checked will check for (**You are indicating a hypothetical situation where you were the owner of the restaurant. Hence, you do not use past perfect tense)the presence of virus in your ingredientsa meal. I hope your restaurant is not responsible for my plight, or else you will lose  all will be good or a restaurant will lose costumers. customers.

Yours faithfully, Marya.

Marya.

Hi Marya, 

I hope you have recovered and are in the pink of health. 

Just a suggestion:

To indicate a hypothetical situation, we can write: 

If I were you, I would do this. / If I were you, I will do that

Hope this helps.
Cheers, Lance

Check it please