I'd love to know more about the toilet paper as well. I have been using the Kirkland brand for several years, but I think they recently changed it (due to the covid craze w/TP) & after that change was when I started noticing symptoms.
I'm considering buying a bidet attachment for my toilets because wiping (& even patting) is so painful. I do use a perineal bottle to rinse &/or wash, but still need to pat dry afterward.