So for full disclosure, the EKG/ECG was to make sure I have no heart issues before going on a stimulant. Being an excellent test taker, I wound up with high scores on the QB Test I took through UF Psych, meaning I scored high in both hyperactivity and in attention deficit. There is some anecdotal evidence that my TBI's may have contributed to it, but it's more that the structure breakdowns made my reactions stronger. So... I'm getting meds to try to improve focus and also mellow out the cacophony of noise that my thoughts are on a moment by moment basis.
Heart is good, brain is working, and now we know there are some things to work on.