Something else that might be useful is a video of an episode, Robyn. If you have a video camera, filming what's going on so the vet can see it may help in a diagnosis.
for a quick recovery for your little tyke!
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."