Comment by ThrustVectoring

Not surprised at all that caffeine helps. ADHD is, bar none, the mental health diagnosis most amenable to medication. Specifically, stimulant therapy. There's no principled distinction between self-medicating and prescriptions here, other than various legal risks, costs, and side effect profiles. Caffeine is particularly poorly suited to this due to adaptation and anxiety, but it's certainly something, especially if you aren't a regular user. Amphetamine is the first-line treatment choice for a reason, and it makes a night-and-day difference tbh.