Yes the symptoms came on quickly he was whining at the side of my bed when I woke this morning, he was ok when we went to bed, if you try to get him up he cries. The symptoms only started this morning.
No the vet didn't do any x rays or blood tests, and no he is not on any medication.
No, but he isn't carrying himself properly. If he was a horse you would say he looks tucked up.
Yes, and very reluctant to get up or walk even for his food, which is very unusual as he is very food oriented.