I was under the impression that you'd be staying there for a couple of weeks, rather than just popping in.
But perhaps this goes to the heart of the issue. If the Doctors didn't think you needed to stay - and people very often stay in psychiatric hospitals for things other than psychosis - then that shows that they genuinely didn't think your symptoms were that worrying.
I am not saying that you aren't in a terrible way right now, you clearly feel awful and are having terrible symptoms, but you have not lost your mind, you will not lose your mind, and you will not slip from reality.
You really have to realize this, and believe it, if you want to make steps towards a recovery. There is no other way. It's these thoughts that fuel the symptoms.
Hope it starts improving in time,
MonkeyD