I had a very traumatic incident occur the other day
What happened that was so traumatic?
I think I may have badly hurt someone.
If you experienced a traumatic event, it would be a good idea to talk with someone to help you process your emotions. You may be hesitant to reach out for help but it's much better to do so than risk keeping the trauma you experienced to yourself and suffering emotionally as a consequence.
I'll be fine. Everything is just fine now. No need to worry.
I would think otherwise based on what you told me earlier.   Hold in trauma can lead to more anxiety in the future.  It is best to process it early and talk it out.