Hi hun sorry to hear about your water infection i suffer all the time and know its horrid.
Defo get yourself to the docs just to make sure its nothing nasty and im sure you will be fine in the next few days. Paracetamol is ok to take if you have pains and drink LOADS of water and cranberry juice and altho it will make you go even more your wee wont be so concentrated therefor wont sting as much when you do go.
I ease the discomfort i find running a very shallow bath enough to sit in to cover yourself down there with the water and if you wee in that it really does take the edge off! I know its really gross and make sure you have a wash after with a soap like E45 or Dove soap (i always use these down there) as perfumed soaps can make it worse and and give the bath a little scrub after!
Hope this helps and hope you feel better soon

xx