
Hi Melissa,
I'm glad that this post has resurfaced as perhaps it has been missed - I missed it anyway ;)
Less than half way through your post I thought this may be a problem with a facial nerve - the reason being it is very similar to a problem I have personal experience of - quite literally me, not my dog :)
The cause could not be firmly established although it was suspected to be possibly down to something as simple as a draft however a spell on anti-inflammatories eventually cleared the problem and since this was around 3/4 years ago I assume it was fully effective as the pain (which was awful!) has never returned.
If the AI given is a steroid, do you also give ant-acid meds before doses? If not, I'd suggest you have a word with your vet about this as even short term steroids can cause stomach problems and of course they should be gradually weaned off same and not stopped abruptly even if symptoms appear relieved.
HTH,
best wishes, Teri :)