Taken 3 days of macrobid still having horrible pain in the kidney area. do i go back to doc or finish meds?

Wait 2 more days: Macrobid is slow to act. I would wait 2 to 3 more days, and then check back with MD if no improvement

See below : The presence of back pain suggests the strong possibility that you may have a kidney infection. Feeling ill, nausea, fever, and/or chills would further support that. Though MacroBID is a good choice of antibiotic for most bladder infections (cystitis), it is “ineffective” in kidney infections (pyelonephritis) due to poor tissue concentrations. Recommend contacting your MD to change your antibiotic