my 11 year old son has been urinating up to 10 times a day for last week/10 days. he is constantly thirsty and is drinking more than usual (always water). He is normal weight, does a lot of sport but seems generally quite run down...tired, splits at the corners of his mouth that won't heal. He has been getting up several times a night to wee also, but sleep walking when he does....this worries me also. He has started puberty in the last few months.