Hi everyone

I have a problem with my cat Ziggy, he is 7 months old, I had him neutered 2 wks ago and since then he has had several accidents, mainly soiling beside the litter tray but today he pee'd in his bed.
He is a lovely boy, very affectionate but also very nervous (sudden noises, unexpected movements, etc). I can't understand why this has started now, he uses the tray most of the time.
Also he only has accidents in the utility room which is where his tray, bed and food are, my other cat Oscar is not in that room so he has peace.
Any ideas?