Happy to report that my cats sore leg seemed to improve, he appeared to have little or no discomfort, and seemed to get about reasonably well. But he still used the "steps" I made for him to make it easier for him to climb up into my bed, up to the computer desk in the lounge (where I often am), and up onto the dining table (which is otherwise not being used).
Unfortunately, I had him put to sleep a few days ago!
This was a very upsetting experience as out of all of the cats I've had/known over the years he was by far the most affectionate cat! We were very close!
He was vomiting intermittently. It was initially thought he may have had just a bit of an upset stomach (which has happened before to him; and it is known that he had a sensitive stomach/allergy to certain foods, particularly dry foods). He was kept indoors to prevent him scavenging and to keep an eye on him.
So he was fasted/starved for awhile and then fed a little boiled chicken (which was done on previous occasions with success). He held it down. But he vomited another meal of boiled chicken the following day. He later vomited bile only.
The last day he ate very little boiled chicken. I tried to feed him some (senior cat) biscuits and a little chicken and lamb casserole. He ate some of the biscuits and a little of the casserole which he seemed to hold down after a couple of hours or so.
He seemed a bit lethargic, and his appetite seemed to have decreased also. His meowing became more of a weak mewing when I took him to the vet!
I went to the vet for a consultation. It was decided that the wisest choice would be to put him to sleep. He was at least 13 years old (possibly much older; he was originally adopted from an animal shelter with very little background information on him). The cause of my cat's vomiting was indeterminate but suspected to be of serious nature.