From that thread you posted (it was a godsend, thank you!) there is a possibility it could be his teeth as the vet did mention they were longer than she would have liked and to keep a close eye on him. Could just be a coincidence that he decided to snack on our sofa!
I tried to check his teeth and his tummy but he absolutely won’t have it, he won’t let me lay him down gently or bunny burrito him – I gave up because he seemed so terrified I started crying (I’m a bit of a wimp!) I’ve given him his favourite alfafa treat for now and we seem to have made up so far as he will jump on my lap when called – he’s still shaking like a leaf though.
It’s 2:24am here so I’m going to sleep and check on him in a couple of hours because I’m quite worried (he’s peed five times in the last hour and they are literally puddles of pee!) so I will update again in the morning.
Thanks for listening (even if it turns out I’m worrying about absolutely nothing), it’s nice to be able to turn to people who know a bit more than me!