Hang in there. I strongly suggest you email (or otherwise contact) your cpn and say 'actually yes, I would like that appointment, please and thank you'. Even if it can't be arranged now, I think it's good to try. And then rest (in the sense of stay alive but sleep or at least, rest).
You won't be surprised to hear that I don't think that your mum is drugging your food.
Try to keep in mind, or on paper, any specific horrible things that are being threatened. When they don't happen...
(Here I must caveat - what I would characterise as 'your illness', what you and others have called 'the system', and I will default to that name also)
...when they don't happen, the system *will try to make you forget* that its threats don't materialise, or try to morph them under your very eyes, or make excuses, or claim clemency, or things like that. This is EXTREMELY hard to resist, because 'the call is coming from inside the house', so to speak. It's inside your mind and can twist your memories, your ability to predict, and your perceptions. You will only really be able to remember times when it seems to have beem correct. Any times where it's been wrong will be fuzzy or rebuilt differently, or you won't be able to remember them at all.
But believe me when I say that, outside of your mind, it's powerless.
Because. If it was as powerful as it says, if it wanted you dead and could replace and control others around you... then why would it need you to do the job? It would be extremely easy for something so powerful to kill you itself. And *I know* it will make convenient excuses, 'oh, well you see, it's all a test, and it's very important YOU do it, to show you're dedicated and...'. I'm sure I'm off-base on the details, but whatever it actually tells you, it's all lies.
Taking it day by day is good. You are doing the right thing.