i am not ok

Hi
Today it was an awful day
I am not ok, i have headache but i went to work.
i wanted go my home to rest.

I am not ok.

Hi,
Today is an awful day (you can't say was, as you use today) 
I am not ok, in the morning I had a headache but I went to work. (when you use different tenses, you better pinpoint a time frame)
I wanted to go home and rest. (go home, come home without anything between)

Hi,
Today was an awful day.
I am not ok and I have headache but i went to work anyway. I wanted to go home and rest.

I am not ok.

Hi,
Today was an awful day.
I am not ok. I have headache, but I went to work anyway.
I wanted to go home and rest.