sand boa not eating

[dwisch3]

so my son has a sand boa that we have had for about 4yrs. he has not eaten since December I think... My dad was in town visting and set the fire sprinklers of in the house and sandy our sand boa was covered in the water but I took him out, cleaned his cage and put new sand but he has not eaten since then.... he has shead once since then and is turning gray now like he is going to shead again.... if anyone has any info on how to get him to eat that would be great. I am so afraid he's going to die. We feed him frozen fuzzies