Ye gods, ended up here by mistake (must have clicked as latest posts moved). The first few words caught my imagination and I looked at your other post. I have Mum in a care Home in one of the neighbouring counties, I cannot believe what you have been through. Each time Mum's continence problems have worsened they have just advised me and told me that they have increased the pad size. The last time was when she decided to hit out at anyone who tried to get her up in the night for the commode and they did not think the distress to her was worth it. I am sure they just got on with it and did not go through anything like you have suffered.
I think you need to ask the Home why all this is going on, they must hold supplies of all sizes.