The tricky thing about stimulants is they are just that- stimulants. In my experience the only time they "keep me up all night" is if I take too high of a dose, or take it too late in the day. When I was diagnosed my psychiatrist said that I had one of the most severe cases she'd ever seen, and she started me on a dose much higher than normal. Guess what? after the first 2 or 3 days it really didn't help at all. my current dose is double what my original dose was, and it still doesn't work by the beginning of the 2nd wk, but I have found that taking a "medication vacation" for a couple/few days once or twice a month is very helpful for "resetting" my tolerance and helping the medicine to work how it's supposed to. Get diagnosed professionally (try writing an "essay" of symptoms you've experienced in the past/present if you can- this can be very helpful for remembering everything once you're at your appointment and your mind goes blank lol) and be honest with your ADHD dr about having tried concerta before- it is incredibly common for adult non-diagnosed ADHDer's to have self-medicated at one point or another so your dr won't be shocked, and if it "solved your problems" then it's possible you DO need the medication,, just in a lower dose so it doesn't amp you up so much. good luck!