How can I support my traumatised friend without burning myself out?

She was being moody towards me a few weeks ago and I noticed a change but thought I was just annoying her with my neuroticism, which is the one thing about me that drives everyone nuts. But it turns out that she was feeling traumatised by her past and trauma therapy went badly and ended up with her cutting open her wrist with a box cutter. I have not dealt with people with a severe personality disorder before. Those who I've dealt with and myself included were mild, so our issues just make us slightly different than we would have been otherwise. I've decided to stick around long-term when she asked me not to leave her as a friend, because when she's well, she's a very good friend. I understand that she'll never be completely free of her demons.

Apparently, she's so sick that she can't be left alone in the house, ever again. I'm the only one of our friends who she's told, so the responsibility rests on me to support her; but I don't know how. I can't tell our friends how unstable she is, as they don't understand severe mental illness like I do, as I have mild schizophrenia and I've been a disability and mental health support worker, I'm somewhat immune to fear. My level of mental illness, where you still look, act and feel mostly okay and you can work and marry, etc if you want to is about all they can cope with. I feel somewhat under pressure and that and my TAFE work and my argument with my other friend have triggered my own dependant personality disorder's neediness. I feel like I need to be hosed down. I don't mean with horniness, just out of sheer nerves.

How can I support my traumatised friend without burning myself out?
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