Pain, inflamation in UT after UTI.

In February I got profuse bleeding & some grayish discharge from urine was diagnosed with UTI . Reports showed E-Coli family bacteria. I got antibiotics course for almost a month as have to change antibiotics in between due to non responsiveness of one type of antibiotics & had to take another type. The course stopped on 16 th of March . One week later I started having lot of inflamation & pain in urinary tract . So did culture but bacteria was absent. As I always have acidity,  took antacids . Then the inflamation was less . I started taking homeopathic pills for acidity & inflamation which is helping. But as I miss the dose again inflamation starts. Want to ask how long this goes on? And what are the reasons ? And if there is a  possibility of shedding of urinary tract lining & if yes how much time to recover the lining? Thanks in advance.