IBS is unlikely 2 cause bladder issues.
Not wiping front to back may well bring bacteria from the back passage into the vaginal area. A sample may show where the bacteria stems from because our bodies have different bacteria growths all over including the digestive tract.
Have U been given appropriate vaginal atrophy treatment? If the AB treatment hasn't cleared the possible infection then that's the route I would consider. It certainly won't do any harm and may well give relief of your 'UTI' symptoms because vaginal atrophy mimics repeated urine infection-type feelings really really well. ABs will improve any inflammation ; if symptoms recur then further investigation is important.
For me
Irritable Bowel Syndrome is slow transit

in that I feel the need to empty the bowel but either nowt happens or it takes an age to pass anything. IBS affects the whole digestive tract ........ sometimes I am so bloated [a recent thread about this] that I am unable to eat, move, drink for several hours

. Fortunately I rarely get painful spasms, though I may have a loose movement occasionally, in a rush! It's all within normal limits for me.
Has your GP requested a stool sample to check for any bacterial growths which may be the cause of any pain?
When else do you open your bowels, it mayB that the rush is 'normal' for you these days as hormone upheaval can cause differences in action. Recently I've been going 3 times a day
