Re urine, I was thinking of things like a urinary tract infection (can cause unusual behaviour plus could explain the wetting) or even early signs of diabetes - which can involve frequent dilute urination. As to the any number of things - over the years I've noticed when my kids are feeling off/unwell (anything from tonsillitis, ear infection, worms) their behaviour gets a bit wacky, but it's not always obvious that they are unwell.