Hi, if anyone is up and has good advice please chime in. I have been treating cystitis by drinking tons of water for a couple of days. the stinging sensations come and go basically depending on how full of water I am. I am now feeling really achey in my abdomen and lower back. No fever, feeling a bit tired and rubbish but no temperature. This is fine to wait till the morning to get a prescription for ABs, right?