These are AMAZING, D_Rainger. I'm very impressed. Thank you.
I'm trying to think of a couple of recs myself, but I can't think of very many.
Bed-wetting is a recurring theme in Jacqueline Wilson's books. One I remember particularly is 'The Illustrated Mum'. There is a desperation scene where the two sisters are forced to run to school when their hungover mother refuses to leave the bathroom, and the younger barely makes it. There's also a description of bedwetting, where the younger sibling Dol worries about wetting the bed when she is taken into foster care.
Also, there is a scene in 'Sophie's Tom', where Sophie, starting school for the first time, refuses to go to the toilet when she is told to and there is a scene of her hopping up and down in desperation.
I can't think of many adult books that mention it sadly, though I would like to read them. I'll try to update when I think of more!