food, drink and coffee/tea might be a good idea
you're just really, really nervous it seems, calm down and try the things above. If that doesn't work then go and get checked out for learning difficulties.
as for being angry about no one picking up on it, you're obviously quite smart and people don't see that as a sign of learning difficulties because it seems like an oxymoron along with the saying 'if it ain't broke, don't fix it', you also have not picked up on it until recently so they haven't gotten any complaints from you which would make them suspicious about it.