Please take time to read this article. The Catholic church is a wonderful, holy and compassionate body. The Church is actively reaching out and understanding the impact of mental disorders. I found this article to be very enlightening. It does not specifically mention ADHD however there is nothing to suggest that ADHD is not included in the desire to accept mental disorder/illness in a way that includes grace and acceptance of a need for proper treatment including the use of pharmaceuticals. Click anywhere on the excerpt to be taken to the entire article.
Here is an excerpt.
Her mood disorder left her furious at God. Because she was a nun, she kept going to daily Mass and regular prayers, but, she says, “I would sit in the back of the church and glare at the cross. I couldn’t believe for a year that God existed.”
The only way Hermes could pray was to read the second half of the Book of Isaiah, the Book of Consolation. “I read those promises of God,” she says. “I didn’t believe it, and I couldn’t find any joy in it.”