a thread to discuss the causes and cures for mental slowness

i'll start
why am i retarded? i supposedly have an iq of 128, but i am still practically retarded. i cannot think straight and i am usually tired. i thought i had adhd so i started taking 20 mg of adderall a day, but i still sometimes feel fatigued enough to sleep while on it. i thought, then, that i might have obstructive sleep apnea because i also have hypertension. however, i have just found out that i don't snore at all. what could be the cause of my retardation?
are any of you guys also retarded despite and above-average iq?
what gives?