Thanks for posting,
Since it was concluded that your wife had bladder and UI infection which implies that her bladder and urethra were inflamed due to the presence of microbes in her urinary tract
. The inflammation is responsible for the lower back pain
(probably there was an associated kidney infection/inflammation or pyelonephritis
) and associated digestive disorder (which resulted from the infection). Your wife will have to receive symptomatic treatment for the bloating
and lower back pain. She can start by drinking much water, eating healthy balanced diet, do mild home exercises, eat much fruits and legumes and take some analgesia or antiinflammatory for the back pain.
If this does not improve her symptoms, I suggest you pay a visit to a nephrologist
who can review and provide better management.
Hope this will help