R.J.
Actually, the meds will probably HELP with sleeping... and it's 50/50 as to whether any med will suppress or increase appetite.
We adhd'ers all have sensory "schtuff" that manifests in different ways. A common one is surrounding food... because
1) many of us are "super tasters", and even those that aren't tend to have texture/heat/coolness fixations
2) Forgetting to eat/ forgetting that we're hungry (When I'm not on meds or OTC stimulants -like coke/pepsi/mtndew... I'm NEVER hungry, and never full. It just doesn't register. I mean, I can feel my heart beat and the blood flow 18 inches in every direction, but my stomach just sort of didn't wire into the "notice me" system.) >>> The converse of this one is people who forget that they already ate and just kind of eat 24/7
3) Other things are just more interesting than eating (conversation, remembering something cool, trying to get back to something cool, etc)
So while stimulants DO tend to suppress appetite (even for us), if the reason we've been eating poorly is related to sensory overload, forgetting, distraction, or hunger not "queing up" properly, meds will *appear* to increase appetite.
The helping with sleeping is a side effect of the whole "opposite stimulant reaction". Stimulants perk us up AND calm us down (by streamlining the constant flow of information). The 2nd *fastest* way to put myself to bed is to drink a quad shot espresso. ((First is Benedryl)). So finding the balance with the RIGHT med is pretty key. When our thoughts and bodies aren't racing, it's easy to get to sleep. Meds do that, but it has to be the *right* med, at the right dose. Same token, too much of a med will "zombie-fy" us in the daytime, and the wrong med (at any dose) will spin our emotions wacky.
I often think of finding the *right* med, as picking your side effects. EVERYONE'S brains work differently in the details, so one never knows until trying how a particular med is going to react. It takes trial and error and paying attention to the side effects of each particular drug at EACH particular dose.
Some few get "lucky" and find the right med, and the right dose fairly quickly. Most have to experiment over the course of several months. Usually several drugs will "work" for the whole focus/attention thing... but the side effects of each are different. Takes a bit of playing around and a LOT of paying attention. Since you never want to play with your brain unsupervised, it's one of the reasons working closely with a psychologist and psychiatrist for the first 6mo-year is highly recommended, and working with a GP is strongly warned against.