A Day Like No Other

It was a day like no other. You had left and that time (1)was forever. You asked questions and they will (2)ever be unanswered.
From that day on, I had to live with that torturing reality. (3)What worse my pain that I couldn't share it with anyone.
In that hardship, tears (4)was my alone devoted friend. I kept sobbing and weeping for days (5)and days. I tried to hide my sadness but my swelling eyes had unveiled my secret.
Unbearable blaming thoughts were mercilessly tearing my soul, and endlessly playing in my mind. Could I have saved your life, if I was there at the right time(6)?. This question will be too forever unanswered.
I owe you so much and I can't believe your departure.
You will always be (7) in my heart remembered.

1. I recommend you use felt like instead considering you're trying to convey a feeling of longing.

2. Incorrect word order, It should be "be ever unanswered."

3. This is conveyed poorly, try What's worse is

4. Was is the wrong word, it should be were.

5. And, while correct, feels unnatural, try using upon instead.

6. This could go two ways                                

6.1) Considering the comma before if, there is no need for a question mark, since it's a statement and not a question.

6.2) If you remove the comma  before if, you turn it into a question and you would keep the question mark.

Please Note: A full stop and a question mark will never follow upon one another since they both mark the end of a sentence.

7) Incorrect word order, It should be "Remembered in my heart" , so rather say 'You will always be remembered in my heart."

Your work was very good aside from the above mentioned issues.

Well done :)

A Day Like No Other

It was a day like no other. You had left and that time was forever. You asked questions and they will never be unanswered.
From that day on, I had to live with that torturing reality. My pain was so bad that I couldn't share it with anyone.
At that difficult time, tears were my only devoted friend. I kept sobbing and weeping for days and days. I tried to hide my sadness but my swelling eyes had unveiled my secret.
Unbearable blaming thoughts were mercilessly tearing my soul, and endlessly playing on my mind. Could I have saved your life, if I was there at the right time?. This question will also forever be unanswered.
I owe you so much and I can't believe you left ( Or I find your departure hard to believe).
You will always be remembered in my heart.