Sorry to hear Gizmo's not feeling well. Hopefully the tests will come back ok & he'll recover from this bout soon.
Princess has been on Science I/D for a few months now following her pancreatitis. I'd get more from your vet to keep him on the exact same the vet put him on until you're told further.
I'll be praying for Gizmo, Princess is proof that YT prayers can do wonderful things.
