Hey, I've recently had some experience with this which may be useful.
I was referred from a dermatologist to a clinical psychologist who in turn referred me to a psychiatrist and I had an assessment this week. I was really worried about the assessment, as like you I didn't want to be sectioned as it would have made matters a lot worse. I spoke to the clinical psychologist before the prior to the appointment and she was very honest and said that she didn't know what would happen.
At the assessment itself it was with a psychiatrist I had never met before and we spent about an hour chatting - or rather me answering his questions. I was very truthful the entire way through, even telling him that I have Soidum Nitrite and an enti-emetic and often think of using it, but that my brothers, relationships and guilt hold me back.
At the end, he asked me if I was willing to "come in for a few days". I was all like:
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I made the argument that I would be under no more risk at home, because those binding factors are still there. We spoke about it a bit and eventually he relented. From what I've read/heard since the appointment, I think this was an attempt at getting me to self-refer or a "voluntary sectioning". It's much easier for them to get you to come in than it is to "forcibly" section you, as it were. This may be helped by the fact that I can present myself very well. Even though I always have the darkness and inner turmoil, most of the time I can hold my tears back and my anger in until I'm alone - so please don't take this as gospel.
After this, he recommended that I change to a new medication but after he couldn't answer my questions about the mode of actions, interactions and side effect profiles I asked him for a bit of time to research it. He followed up with me today and didn't have a lot more to say.
I don't know whether this is typical or helpful, but either way I hope you find some information useful. This is the first time I've spoken or written about it in detail, and it's actually nice to get it off my chest.
I hope your assessment goes well, and if you would like to bounce any more questions off somebody, feel free to ask.