I remember many small things bothering me more than they should have when I lost my dad. The world seemed clearer and crueler.
Every little irritation was like "Why am I focusing on this, DAMNIT".
Don't beat yourself up on it. At least partially you're dealing with trauma, and that shock can severely golly with the day to day.
Take the time you need to process. Autopilot can golly with us all, and at least this scrape was minor.
One thing I find helpful when I start getting super bless'ed stressed out is to act like I'm piloting a ship, instead of my body, and making sure each action is a one off. Reach the arm over there to pick up the pen. Don't knock the glass of water over with my elbow, focus on what I am writing.
Multi-tasking is a bane.
Another thing I find helpful, when I need to get something done, is to make sure the music I am listening to is instrumental, or doesn't have lyrics. It helps keep me on track.
I am sorry for your loss. I know the words can sometimes feel empty, but I really am sorry. When we lose someone, it leaves a long shadow.