One for the guys...
The diabetes symptom that got me to the doctor was "down there". Pain on peeing, my piercing getting very sore, and what seemed to be phimosis. The problem turned out to be thrush, which makes perfect sense when you think about: all that excess sugar around for it to grow on... I'm on fluconazole as a prophylaxis (I also have HIV disease, and thrush is a regular visitor when my CD4 count goes down, but up till then always in my throat). Canesten cream cleared up the initial infection no bother, but although you can buy it over the counter, PLEASE get the doctor to take a swab to confirm thrush rather than self-medicate. (Besides, Canesten is bloody expensive!)
Steve