Before going down a road that involves powerful stimulants that have a high likelihood of abuse or misuse -- the danger is that they're fun, and one develops a tolerance, just like other similar illegal drugs -- it might be worthwhile to investigate a mediation practice, or other exercises to improve your attention. If you're already high functioning its likely not as bad as it seems.

From experience: First thing to go with the stimulants is healthy sleep; it's often hard to sleep on amphetamines. But in the morning, because you've got a script, you can take a pill and not worry about it (but the body remembers). Next thing to go is healthy eating; you simply don't need to eat when under the influence, or you do -- but you forget. Soon, those things combined could have the potential to turn a high functioning and healthy life into quite the opposite. But in the beginning -- especially if you've never experimented with stimulants recreationally -- you'll feel better than you ever have. Stimulants are euphoric. It's a trap, it wears off. Side-effects are likely. I've said it in a previous comment, but it's profound and interesting until it's not, and once the stimulants are gone a dark depression is very possible.

Attention is like a muscle, but also -- attention isn't everything. It could also be ones attitude towards these things.

Be skeptical -- understand that there might be blind spots in your thinking about your problems.