Cat Jaw trembling unable to eat

I am writing in for a woman who lives in the UK. From what I understand one cannot just take a pet to another vet for second opinion. Instead they must fill out a huge paper trail & have forwarded to the next vet before they will even check out an animal!
Ok here is problem with her kitty:
Started out: mouth sores and shaking jaw with copious drooling
Initial vet visit external exam: "Tuesday when she couldn't examine his mouth properly and gave him an
anti-inflammatory jab. She was quite concerned that he was putting his
tongue over the left side of his mouth and suspected "something nasty"
underneath it."
2nd visit to vet under anesthesia:
"Vet found nothing untoward except for a "few small red spots"
in the upper right hand side of his mouth. She gave him a long acting
antibiotic injection along with anti-inflammatory jab. He came home very
dopey and drooly in the evening but is now managing to lap raw turkey soup
with raw organic chicken liver. The shaking jaw however continues and he
remains unable to 'eat' - tho can take raw soup from a spoon, this is
despite being perfectly well otherwise and leaping around like a kitten."
Updates:
The cat plays normally and everything but she must hand feed him as he cannot eat on his own at all. He has a very good appetite and will eat a lot being hand fed but none of the symptoms have changed.
The cat was not hit by a car or anything, is indoor kitty only.
Looking for possible answers and possible treatments this woman can suggest to her vet.
TYVM!
Clight

[opus88]

what a system they have!.........this can be a most complex problem to pin point, I wish the Vet had at least done some xrays.
I did find a couple of sites with some thoughts for her to follow up on, other than that I'm afraid I'm not much help, perhaps someone else on here can offer more insight.

http://www.marvistavet.com/html/masticatory_myositis.html

the other won't copy, I'll find again and repost later...to do with tendonitis or 'lock jaw'

most of this is talking about dogs, but I see no reason it couldn't be the same for cats.

[opus88]

found it again, get her to read thru all this and see if anything sounds like what maybe ailing her kitty, please keep us posted...has kitty ever had dental work done?

http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=2536

and www.ehow.com/how_6339030_recognize-various-types-ankylosis-cats.html

sure hope a treatable condition can be dx'd

[zodiacqueen]

This sounds like a possible injury-broken jaw or possible tumor!  Has the cat's jaw been x-rayed yet?  If not, I would strongly urge your friend to get this done!

Best wishes!

[clight]

Opus88: THX for the links. Am fixing to go read in a few minutes. After I read them if it sound like what’s going on with her kitty I will let ya know! BTW I am not so sure the vet didn't take X-rays. Seems to me that would have been one of the first things her vet would do! I mean she externally examined the cat one day, gave antibiotics n anti-inflammatory, then next visit she put the cat under and really looked it all over inside the mouth and everywhere she couldn't while the cat was awake, So I am baffled as well as the owner!
ZodiacQueen: As I mentioned above I am not so sure the vet didn't already do X-rays. Also this cat is an indoor only kitty so being hit by a car or something like that is ruled out. As mentioned in my post, the vet did say she was a bit concerned of a possible tumor since the cat kept laying its tongue to one side but upon internal exam found nothing at all! The lady says the cat is absolutely full of vim n vigor playing and everything a normal kitty does except for the inability to eat on its own with the trembling jaw! Since it has already had antibiotics and anti-inflammatory, it sure is a mystery.
To all:  Yes it appears the UK system of taking your animal to the vet sounds absolutely absurd! She says she is serious; u cannot just go take you animal to another vet. Instead u must send a formal letter to the current vet and ask for all of the animals’ records, possibly cutting all ties to the original vet, then you must find another vet willing to take over, and this does not happen right away but rather the new vet must be sent all of the previous records and then and only then is an appointment made! Talking about “Jaws”; all of us on the FHV board jaws just hit the ground when she explained all this to us!
Anyhow I have sent her another email asking if the kitty did or did not already have X-rays & will be getting back with all of you!
I have a problem going on with many of my recues that I am fixing to post separately now. Plz chime in on that one too!
Kindest Regards!