Has MD done a culture and sensitivity yet? Just hit and miss with the antibiotics is not a good idea. Find the bug, take proper antibiotic…resistant forms are rapidly spreading and we have several UTI superbugs.
It is not unusual for elderly folks to get very confused during urinary tract infections, but it also speaks to the level of cognition when its such a short walk from normal to abnormal behavior.
Flush out the bladder with lots of water during the day to keep bacterial levels low. Take the cranberry pills before bed. AZO is avail OTC for symptoms of frequency, urgency and burning.
Good luck anon.