Fybogel?
Real ale?
A ruby?
This one is a proper bastard, rock hard and the size of a housebrick. Ruined my day it has.
Microcrystalline enema. £2 from pharmacist. The <ahem> nuclear option.
I have movicol which will hopefully soften it a bit, and a prescription thing called sodium docusate that's supposed to stop this from happening. I've had 3 movicol so far...
Bloody being ill is a pain in the arse. Literally.
Don't overdo it - you could end up with the other extreme.
Warm bath can help too.