Mrs Mickles 21 yr old son S seems to be having some sort of psycotic episode. A few days ago he was his normal bright outgoing intelligent self, then he started acting strangely, big mood swings, not sleeping, washing or eating for days. It was clear that there was something wrong, our questions met with uncharacteristic aggression and he started behaving very erratically. We thought initially that the pressure of uni exams and the sleep deprivation combined with a few too many joints had made him a bit manic but it soon became clear that it's more than that. His condition changes throughout the day, he can be quite lucid occasionally but at other times he cannot comprehend simple statements like for example 'please move your car'. He imagines that 'they' are tracking his movements through his wristwatch and are watching him through his TV. He babbles incoherent gibberish. Mrs M invited his idiot father over on Monday evening and the four of us sat around the table (at this point we though it was some kind of exam stress triggered nervous breakdown). It transpired that on the previous Friday S had consumed '20 or 30' balloons of Nitrous Oxide, laughing gas. He and his idiot father sell it at night clubs for £1.50 a pop. Idiot stood there and watched him do it without intervening. A quick google; Apparently the rush is caused by simple lack of oxygen to the brain. I suspect brain damage. A visit to the GP yesterday was a waste of time. The Gov. drugs advice site Ask Frank doesn't even mention NoX. Any advice gratefully received.