Today was a busy day.
In the morning, after i got ready for  a work ,it suddenly started to rain. I had to go home for taking an  umbrella.This  episode what happend to me caused that I was nearly late for a work.
Then I worked hard all day.
So ,now I am tried and I hope for better tomorrow.

I free a little trie.= =

Today was a busy day.
In the morning,when i get ready for work ,it rained suddenly.i have to went home for an umbrella.The episode should me was nearly late for job.
then i hard work in the all day.
so ,i am tried,and i hope it's well be better in tomorrow.

---  Hello Vivian. How are you? 

 (a) I feel a little tired.

(b)   Capitalize   I when referring to yourself. It is a pronoun.

(c)   No commas needed in  sentence   3 about "In the morning...etc."

(d) I had to go home   +   The episode (rain) almost made me late for work.

(e) Now I am "tired".

   Nice effort my friend. Your idea flow in a logical sequence. Minor spelling errors which do not matter so much.   Keep writing  Vivian.   Your  efforts will produce great rewards.---Warm Regards,  Bruce R. Bain

I feel a little tired

Today was a busy day.

In the morning when getting ready for work, it suddenly started raining. I had to go home for an umbrella. This event nearly made me arrive late for work. Then I was working hard for the whole day.

So I'm tired and hope tomorrow will be a better day.

Well done. It's very clear what you want to write. English grammar is difficult...