I agree with Alan - Sudacrem is wonderful stuff but it sounds like your bun may need more than that.

I find it really difficult to know if my buns are in pain - they seem quite stoicial furries - so I take them to the vet if I am in any doubt. Mine is very good though, if it only involves a quick check to reassure me she doesn't always charge me. There often has been something wrong though - I just get a 'sense' something isn't quite right - it's weird.

I'm glad you are going to get yours checked over - it must be horrid having sore paws.

I've never tried Megazorb - will have to keep an eye out for it.

Good luck to your furry one - let us know how he does?