I know this must be difficult. I think it is awesome you are considering all of the possibilities instead of going with your initial thought that someone broke in. It is great you are open to exploring your therapist's suggestion.

I think if we were to look at this from a probability perspective the most likely answer is that you moved the items you mentioned. You've had memory loss recently and these are items you could have easily misplaced during a blackout.

Is anything missing from your house? If not, it is unlikely that a burglar got in. If they wanted your valuables and already broke in they would have grabbed them the first time. Burgalars typically do not return to the same house multiple times.

Do you keep anything super sensitive on your hard drive? It is unlikely someone would break in to look at your data. It is typically less risky to just hack in remotely. If someone is breaking in they are going to a lot of trouble and putting themselves at great risk. Can you think of a reason why anyone would do that to you? If there is no clear motive it is likely you moved the items.

This may be a little overboard, but if you are truly worried you could always set up a camera at your door. That may offer peace of mind.

I do think psychosis causes this kind of paranoia and you've been experiencing psychosis lately. It also causes strange behavior and memory loss which could explain why you would have done this yourself. You also said you sleepwalk. People do all sorts of strange things in that state. You're also on heavy doses of meds at the moment.

I personally do not think anyone is breaking in, but it is just my guess based on all of the data you have provided as well as your other recent posts. I'm sorry this is happening. I hope you are able to feel comfortable leaving your home again soon.