|>>|| No. 29670
This implies she's taking medication at least, so that sounds like an improvement from where you were last year. Honestly, though, from what you've mentioned I'm equally concerned about your own mental wellbeing.
>Some of the ways her behaviour manifests borders on the abusive - stopping me from leaving a room, hiding keys, keeping me awake
It's hard to offer advice because there's so much potential variability here - "stopping me leaving a room" might just be an arm on the door handle for a minute or two while you're having a minor disagreement, "hiding keys" can be a petulant game and "keeping you awake" could just be irritating "are you still awake? Wow, I can't sleep. I'm just wide awake over here" etc. If, however, there are substantial physical altercations, or if she's regularly preventing you from leaving the house with the front door/car keys, or regularly and deliberately denying you proper rest, then these are serious matters and are unquestionably abusive.
We have a significant problem in this country recognising that significant numbers of men are the target of various forms of domestic abuse. If you look up examples of domestic abuse online, it is genuinely shocking how many of them use gendered pronouns, such that the man is the abuser and the woman the victim. Prepare yourself for this, and then go read, and see if any of it fits. There are also hotlines specifically for men:
Give them a go.