Simon's a cutie! I'm sorry I can't help you with your decision, luckily our babies have not had this problem yet.
Have you done some google searching online? We found lots of information about other health conditions our "kids" have been through that way.
Good luck! And give Simon a big scratch behind the ears and a cuddle from all of the critters, me and DH.
Hugs and butterflies,
~T~