Hello, I went to the doctors yesterday and I have a water infection, he has prescribed antibiotics, overnight I got pain in my lower back and have been in considerable pain, this morning the pain isnt as bad but I feel unwell, do you think I should go back to my doctor or give these antibiotics time to work. I had a cystocopy last year and I have chronic cystitis cystica and i also had my uretha stretched, i went through chemo last year so I havnt healed.