In my opinion, if you have coverage now, and you have a concern with his diarrhea, why not get him back on enzymes asap? ( I assume that was one of his previous meds...) I have a 4 year old, no cf...and can' t imagine how life would be if she had constant potty issues! I think you need to get to a cf center, regardless of how familar your ped is with cf. They will get you back on the best preventative course. It will be worth it in the long run.