I Have Been Having Left Flank Pain Started 6 Weeks

I have been having left flank pain started 6 weeks post pardum from vaginal delivery I had blood in my urine so dr put me on microbid for 5 days it went away the xome back once I finished my antibiotic and he put me on smallwr dose every day for mouth got better now it's back and I have horrible taste in my mouth aftet being on medication for over a month