I was in a bad car wreck today
How did you end up in a wreck? Who was at fault?
It was one of my worst days ever, and they are accusing me of driving under the influence.
Well if you did drive under the influence, then that is an extremely reckless and terrible thing that you just did. One should always try to drive carefully, but if this was just a simple accident, then it will be okay in the end.
It's not that big of a deal. I'm fine.
It's good that you are okay, but if there is a suspicion that you were intoxicated, then you need to prove that that wasn't the case.  Stay at the scene until you can demonstrate that you were sober when this happened.