Upstairs neighbour died and wife wants to move as she can no longer settle in our house

Right first things first, what your about to read may make you feel sick so I'll try and keep it as mild as possible.

Me and my wife live in small block of flats. 2 flats at the bottom. 2 on the 2nd floor which is me and my wife and a young couple next door. There is 2 flats on 3rd floor which is Derick who is directly above us and then the other flat which has been empty for years apparently and has never been repaired.

Derrick was a very old man who was not a talkative person and really kept to himself. We very rarely ever saw him or even heard him for that matter

It started in June . This is where I'll try my very best to keep this as mild as possible....

It started in June and this stain on the ceiling just appeared. I went up to knock on Derrick's door to see if he had spilt anything but there was no answer. My wife has cleaned up the stain and it had gone. After a couple of days it started coming back so I went up again but again, no answer so I left him a note telling him about the situation. Same thing happened a few days later again and I was getting a little annoyed so again I went up to knock and nothing.

The stain did go away for a while after this so I thought he had seen the note and investigated on what could have been spilt or what could be leaking.

The stain left some discoloration on the ceiling so we painted over it. Weeks later the stain started to appear again but this time with a rather bad smell. My wife thought it might be a fish tank as it smelled like dirty fish water so again I have gone up there and again no answer. I slipped another note under his door this time with my phone number but I never received a call or text so I was getting annoyed because whatever it was it was coming through our ceiling and he wasn't phoning or texting or answering.

So we cleaned up again . Few weeks later more discolouration and had to paint again.

Before Christmas the stain came back but this time much, much more and more wide. Still no answer so I rang up the council... My call was interrupted as my wife screamed as if she had seen a mouse... I came into the living room and some of the ceiling had come down and was absolutely riddled with maggots and the stench was absolutely horrendous. That was when it had accurd to me that Derrick had died and no body knew .

Unfortunately I was right. Derrick had died and was apparently facedown in his living room and was 70% decomposed and all that staining on our ceiling was his body ... Me and my wife just couldn't help but be sick as you could probably imagine.

His body was taken away and the council did repairs very quickly so everything is back to normal now but my wife just can't settle after that. I couldn't settle for a few weeks but I did get better and I can now relax in my home again but my poor wife just can't.

I'm not sure if we should move or what but my wife wants to move so not sure if I should wait incase she gets better like I did or just move.

Some advice please and very sorry if this made you feel funny, I did try to keep it mild