Oh God, the repeating of requests! DS still can't carry more than one message at a time, and he's 21! 
First started to wonder when he went from being able to "read" whole school reading books (he was memorising them) to not recognising a word we'd sweated over for 10 minutes, when the word recurred in the next line. (School were using "whole word recognition" system, I was taught phonetically. It didn't make for happy times.)
Broached the subject with his Primary Three teacher who said simply that he was "within acceptable percentages" or some such shite; all well and good, but he'd been way ahead before, and his spoken communication showed much greater comprehension that his reading. School was of the opinion that dyslexia was just middle-class parents with stupid kids. I'm really not that middle class.
He also mixed up b and d, a few other things I forget now, and his father and paternal granny are both mildly dyslexic.
We happened to move house the summer he moved from P3 to P4, we mentioned to the new school when enrolling him, they had him tested by an ed psych within 6 weeks and he ended up with those coloured plastic sheets.
He seemed to "get better" with puberty, though I am eternally grateful to JK Rowling for the only books DS ever read for fun!