Update on the situation:

A lovely bloke from my orgs after hours came to check if I was alright. We had a good chat, and I used the confidence I gained from it to check all the rooms to make sure the windows are all locked. I noticed his window in his room was opened about half way, which is concerning because I don't remember noticing it when I had a peak before. But of course I might just not have paid enough attention. Also locked his other spare bedroom and the spare LT bedroom windows. Now if he did come back, he won't be able to get in. He could try the windows on my side of the house, but they're a few metres off the ground and would definitely make noise trying to get into.

The worker will be here in an hour, so I've almost made it to safety. I'll give him a mini handover and explain the situation to him and sight ID before letting him in. Unless he just uses his key (there's a lockbox with a front door key which he'll have a code to).

Thanks for all the advice and well wishes everyone, I do really appreciate it. I'll probably be on edge for a week or two, but after that I should hopefully start to relax and settle back in. The overnight workers will stay for the foreseeable future, although I do have the power to say I don't want them anymore if I wish.

I don't think I need to fear for my safety, I think this kid is more the type to threaten and intimidate but not necessarily assault or actually go through with anything. But he seems to think I'm personally responsible for ruining his whole life, and seems to be kind of unstable so I'm still going to take full safety precautions.

I pay more tax than I need to, so I'll get a nice refund whenever they finish processing it (probably in a couple of weeks). I'm definitely going to buy some of those alarms you stick on doors with command strips that set off the alarms, and I've also talked with the program leader about organising to have some security cameras installed. I offered to manage their installation personally, to both save on costs and for a cool project to do (in case you lot haven't noticed, I am a bit of a computer nerd).

I also haven't had anything critical stolen or damaged, which is good. Nothing I can't live without. I don't have high hopes he'll be arrested or charged, but even if he doesn't, I'm covered under my orgs insurance, so they'll be replacing/fixing everything that's been lost or stolen.

(Although on a bad note, I realised about 4 other things have gone missing, all mostly low value things from my main room. I think this happened last week when they had to fix my lock for an unrelated reason, I think somebody left my room unsupervised and he took the opportunity to nick a few things that were in sight. Nothing super valuable, just my diffuser, a powerboard, an echo dot, and some cheap earbuds).