Howdy,
I am also T1 and ADHD I currently take Concerta XL modified release.
I do get big depressive dips, but still tend to take care of Insulin correctly etc.
Biggest stress is the un interested Bosses at work, they don't get it.
I don't think the Concerta affects my BG Levels but they have a nasty wearing off type side effect.
I was told by a pharmacist, it's quite common to be put on Antidepressants to counteract the ADHD Meds
I did this for a while, but don't like them.
It's a difficult balancing act