Do you think the karma is true?

I had several chickens a few days ago. I should had to kill them for the pot my family, because my mother and my wife didn’t dare do it. to kill chicken. My father used to do it  dared to, but he wasn’t at there. So I had to do it. I had never killed a chicken before, so you can imagine how horrible worse it was. I cut the chicken’s neck (I slit the chicken's throat) and it struggled. Bloods splashed everywhere.
And I feel pain around the my neck today, it's painful to turn my head. it almost can’t turn back.
Buddhists said say that everything in the world have has karma. If you do bad things, bad things will happen to you. Is it true?

Do you think the karma is true?

I had several chickens days ago. I should needed to kill them for my family. because My mother and my wife didn’t dare to kill chickens. My father dared to, but he wasn’t at here, so I had to do it. I had never killed a chicken, so you can imagine how worse worrying it is was. I cut the chicken’s neck and it struggled. Bloods splashed everywhere.
And I feel pain around the my neck today, it's almost can’t turn back hard to turn my head.
Buddhists said say that everything in the world have has karma. If you do bad things, bad things will happen to you. Is it true?

Do you believe in karma?

I had several chickens a few days ago. I needed to kill them for my family because my mother and my wife wouldn't dare to kill a chicken. My father would dare, but he wasn’t at home so I had to do it. I had never killed a chicken before so you can imagine how bad it was. I cut the chicken’s neck and it struggled. Blood splashed everywhere. 

And However, I feel pain around the neck today, so much so that I almost can hardly turn? back.
turn my head / move my neck? Buddhists say that everything in the world has karma. If you do bad things,bad things will then happen to you. Is it true?

"for" in the first line does not make the meaning clear.  "on behalf of" "instead" "for the benefit of" are all possible alternatives and each has a different meaning.

"turn back" is not right but I don't know exactly what you mean. I gave two options.

Check punctuation changes.

Good article.  Well done.  It's nice to read personal stories.  Thanks.  Michael