My first question is why you would take an adult patient with a complicated PMHx when assigned to the pediatric side... 
My item for the differential:
Long QT syndrome - I didn't get out my calipers, but on eyeball it looks to be borderline at best, and the QT interval can be worsened by both methadone and proton pump inhibitor medications. Myocardial ischemia can also contribute, and his history of diabetes and Hypertrophic cardiomyopathy put him at risk for cardiac ischemia - the neuropathies suggest his diabetes has not been very well controlled. Data suggests effexor is not likely contributing, but case reports suggest it might.
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"The dignity of man is not shattered in a single blow, but slowly softened, bent, and eventually neutered. Men are seldom forced to act, but are constantly restrained from acting. Such power does not destroy outright, but prevents genuine existence. It does not tyrannize immediately, but it dampens, weakens, and ultimately suffocates, until the entire population is reduced to nothing better than a flock of timid, uninspired animals, of which the government is shepherd." - Alexis de Tocqueville
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