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His eyes also seem to not quite focus, they don't stay still, its almost as if he is dizzy.
sounds like Vestibular Disease. The not being able to stand part too. My sister's dog had it for a month. For a month he could not stand at all, then, just as her Vet said, it stopped and he could stand. Google this up and ask your Vet. He did retain some head tilt but it gradually diminshed. Dogs are just like us, they can have different things at the same time and it can be really hard to say which symptom is caused by what ailment. The inappetance is typical too, but associated with lots of things.