and even without me willing it so, the anger rises up in me and I get incredibly frustrated if something isn't working right the first time.
A child or adult
can be rash, impatient, easily frustrated, and very impulsive. It's not just their fault - it's a chemical problem. Medication, diet adjustments, and behavioral modification can help these immensely - but the child will still have ADHD.
I also might advise reading up on it some.