What's making our puppy sick?

Our dog, Rocky, has a very weird concoction of symptoms that the local vet cannot figure out and that have us very worried:

vomiting

constipation

shaking/ twitching/ trouble walking

irritablility

low body temperature

no eating/ drinking

lethargic

Any dog lovers/ vets have any ideas?

I read on a vet's website that prolonged low body temperature means the dog's organs are shutting down. It's so sad to see the happiest, most obedient dog in the world be in pain.

The vet suspected that he has a calcium deficiency and gave us some supplements, but it isn't giving any long term help. Any suggestions?

christine.hand@yahoo.com