R.J.
If you draw a relatively straight but wavy line across a sheet of paper... you've just drawn a neurotypical person. The normal ups and downs in a day/week/month.
Now, over the top of that line daw a VERY wavy line. The highest peak about 1-2 inches above, and the valleys about 1-2 inches below.
Now on top of that line, draw a line that is pure peaks and valleys. VERY wavy, with the highest peak 4 inches above, and 4 inches below.
What you're looking at is the emotional variation between a neurotypical person (the mostly straight line), an ADHD person (the 2 inches above and below), and a Bipolar person (the extreme line).
When ADHD people are happy, everyone around us is happy (until we start to annoy them). Our joys are ecstatic, our eyes shine, we light up whole rooms. When we're sad... we're down in the depression range. We're FAR more similar to someone who is bipolar, than someone who is neurotypical. Our emotional swings aren't as severe as a bipolar person AND we can learn through coping mechanisms to control them to a degree (bipolar people can't)... but the emotional swings, and the intensity of them, is part and parcel with ADHD. Right along with giftedness, sensory "schtuff" (similar to SPD), hyperfocus, and all the things that don't make the press.
A quirky thing with ADHD is pure memory & pure emotion. Most people's emotions fade over time. If they get embarrassed, that embarrassment lessens until it's just a memory with no emotion attached to it. If an (unmedicated) ADHD person gets embarrassed that embarrassment stays the same for HOURS. It doesn't fade. Moreover, the emotional response *usually* gets tagged with the memory. So if you're remembering something 5, 10, however many years later... the same flush/nauseous/shame strikes as if it had just happened (until the embarrassment gets untagged, by believing differently). Most people remember being embarrassed at the time, but they don't feel embarrassed all over again. ((Or angry, afraid, happy, etc.)). Most people don't feel an emotion, at full strength, for HOURS, until it's replaced by another emotion.
Stimulants (and other ADHD meds) DON'T "just" make us focus better. They bring our emotional range into a more normal area, turn off part or all of our hyperfocus, alter how emotions get attached to memories, alter the time in which we feel emotions.
Anxiety levels PLUMMET as our minds calm down and our emotions are regulated. Whew! Depressions lift (adhd depression is often closely linked with our anxiety levels; esp fear of not being good enough, getting enough done, perfectionism, etc. Then you link the sustained emotional capacity, and those fears/ doubts/ plagues of low self worth stemming from anxiety become depression). Our "highs" don't tend to go as high anymore, but with the shorter "high/ feeling good/ happy" they're more *sustained* (which for most people is worth the trade off... esp as on the RIGHT meds, a person can usually intentionally get as happy/ goofy/ excited -the 'high' marks as they can off meds. It just takes intention, instead of randomly popping in... AND when it's time to stop, we're able to get serious again).
Meds CHANGE the way we process and store information. Including emotional information, sensory information (our SPD type schtuff usually alters, we're able to tolerate things we couldn't before), and intellectual information.
Stimulants calm us down, and perk us up at the same time. No longer swimming through mental morass. No more trying to see through goo.
Our brains just react to stimulants and neostimulants differently than neurotypical people. And then in our OWN group of people, our brains react to different stimulants in different ways.
ADDERAL has a nickname, ADDERAGE, because for about half of ADHD types, instead of regulating our emotions, that particular combo triggers irritation and anger. In the other half, it does nothing of the sort. I'm in the half that it causes no irritation whatsoever (but I get other side effects I don't like, so I don't take it... for myself I lose every single drop of creativity I've ever had. But a girlfriend of mine -also adhd, but on adderall- doesn't get THAT side effect. She's not only creative, but PRODUCTIVE on it, because she doesn't perfectionism cripple herself, or get distracted and move onto something else before completing things. I get that SAME effect on different meds, btw.)
To not feel so alone... DO check out "You Mean I'm Not Lazy, Stupid, or Crazy?!?" by Kate Kelly and Peggy Ramundo (Yay! An adult w/ ADHD book written BY adults with ADHD). I recommend this book to parents all the time, because it shows a complete life w/ ADHD and show a lot of the WHY does this, this, and this happen and why is that, that, and that recommended / not recommeded. But the book is written FOR adults with ADHD. Great resource. and www.additudemag.com Every once in awhile I stumble across an article on there that is baloney (and I, and many other people with ADHD are quick to point out it was written by someone with their head up their bum), but it's the best online resource I've found. Ever. About 95% fantastic. And NOT (thank god) all about kids. I swear... what idiot thought we got a new brain on our 18th bday I'll never understand.
Anyhow... do adhd meds help with depression? ABSOLUTELY. They can also make it worse. It depends on the med and that person's brain chemistry. One of the things to keep an eye on med-wise is exactly how it affects your mood. If you find yourself easily irritated, angry, or depressed... it's the wrong med. If you have GREAT emotional side effects, then it's time to make sure the other side effects are also what you like, and that the dose is where you want it.