Any help gratefully received,sorry this is long 
Pucinni was a stray who adopted us when he was about 6 months. He was practically feral and in a dreadful state but he's settled in beautifully and is 2 now. Not 100% sure what breed he is but he looks like a Bengal and sounds like one too (
)
A year ago he had a really bad UTI and nearly died, changed his food to half Applaws dry and half wet but last month he had another and we very nearly lost him. He refuses the Science Hill prescription- don't blame him tbh,it looks disgusting,so he's on half Gourmet wet and half raw which he's doing fine on and vet is happy with how it's going.
When he was ill he had to have a catheter which was awful as he just dribbled pee everywhere constantly so we had to contain him in the bathroom.
Anyway,since then he's been spraying inside at least once a day. There doesn't seem to be any rhyme or reason why or when he does it,he just does. He's been neutered and it's not a huge spray more like a few drops but he's definitely spraying.
I think he's stressed, he's very highly strung anyway and more like an over excited puppy than a cat and seems to home in to cats in the vicinity of the house. When he starts yowling,I make a big show of rattling the door and chasing them away so he feels protected but yesterday he sprayed because I was sweeping up and tonight he finished his food and waltzed up to the the living room door and sprayed.
I took him to the vet and was hoping he'd suggest some kitty valium or something but he said 'no easy fix, don't crowd him just ignore him' Wish I could ignore him,he is such a demanding cat!!
So,I've ordered Zykleine (sp?) and Homeopet - I'll try anything at this point and we already have Feliway diffuser and the spray.
Really,this is awful and it can't be nice for Pucinni as something is clearly wrong.
What else can I do?