The side effects you have mentioned are quite common. have you spoken to your prescribing Doctor about possibly changing the medication to a non stimulant (Straterra)?
What you were doing before, by exercising every day is possibly the best thing to do. Exercise raises the levels of certain neurotransmitters needed for concentration but only for a short period (2-4 hours). Taking regular breaks and running up and down a flight of stairs a few times may give you the boost needed.
Other than that, following a healthy diet higher in protein than carbs will also help; get plenty of sleep and avoid stimulants such as coffee and cigarettes (they stimulate short term memory but not in a healthy way). Supplementing with omegas is also a good way to increase concentration.
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