Since these behaviours have been present as a child, there is likely no connection to the hypertension medication, unless you started this at an early age.
Your symptoms do seem typical of ADHD, however, if you are after a diagnosis please ask your GP for a referral to a neurologist, psychiatrist or psychologist who specialises in ADHD.
Exercise is very good if you have an abundance of energy; perhaps fitting a second walk into your afternoon would help you focus as exercise releases dopamine which is needed for concentration.
You could supplement your diet with omegas and evening primrose oil, the latter will aid concentration but also has good properties which aid sleep.
Before you do anything though, consider whether the way you are causes an difficulties in your life. If you are happy and the people around you can manage with your busyness, does it really matter? If it is effecting your life and those around you, then it is time to seek additional help.
Best of luck,
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