I had a long day. i've = I've worked for half of a day and while we were working, we had a minor accident and that made one of peers sick off. =  we had a minor accident that made one of my peers sick. So, i = I was the one to cover for her position. Dealing with a new work had me run rugged. Let me give you more details about the accident. There are = were some machines running around in circle. But the next thing you knew, the machins was out of control = the machines went out of control  and crashed into a wall and made the workplace a whole mess. One of co-workers who worked very close to that gear was hurt a bit. = One of my co-workers who worked very close to that gear was hurt a bit. A manager made her call it a day and pointed me as her cover-up. I was nervous about the accident happening again to me. It turned out that it didn't, but it kept me on my toe until i left work. Here is my last work of a day. I hate that manager who put me to that work!!!.

NOTE:

1.) Be consistent with your tense. You used PAST TENSE since the beginning of your essay so make sure you continuously use the same tense. EXAMPLE: are = were

2.) Add personal pronouns when narrating a story specially if you are narrating it on your point if view or what we call 1st person point of view. EXAMPLE: One of co-workers who worked very close to that gear was hurt a bit. = One of my co-workers who worked very close to that gear was hurt a bit.

3.) Don't forget to write the pronoun "I" in capital letter. Example:  i've = I've ,  i = I