My best friend has been experiencing extreme thirst, dry mouth/throat, and frequent urination; sometimes she urinates for long periods of time and sometimes it is just a trickle of urine. She has also been more fatigued resulting in 3+ hour long naps, having back pain, and waking up with headaches. The most interesting thing is that she has itchiness around her vagina (not the vulva). In the past, she used to drink nothing but diet sodas but has recently switched to drinking nothing but water and a lot of it daily.