Wow, sorry for this horrible experience. Polysomnography is like any outpatient procedure (yes, it is outpatient in all but extreme cases where an ER doctor might ask for a favour from a local lab to get you in as a special and urgent case, but 99.99% are by appointment and by referral, usually). If you have no unusual sleep behaviour, they can't do much. So, no unusual and sustained limb movement, no REM sleep patterns at all, no deep sleep...that kind of thing, they might have some treatments. But if you are awake, there's not much they can assess.
I take it you have had a brain scan to check for tumors or ischemia/stroke? Blood chemistry is normal? Any childhood trauma that might be suppressed but at play? No general anxiety disorder diagnosed? (BTW, the DSM is a political product in that, every three/four years ,the big wigs in psychiatry get together and there's a lot of lobbying behind the scenes to get the latest darling 'syndrome' or 'disorder' included, something someone has gotten a PhD writing and that many others like because it seems to accurately model or to explain a certain behaviour. The DSM sounds like a modern and current diagnostic tool, and in some ways it is, but it's also a product of popularity contests in the medical establishment).
I'm sorry I can't offer more. Hopefully someone will read your post and have some similar background and offer you some suggestions. I wish you the best of luck.