If you've been in hospital numerous times before, they may find that you're becoming too dependant on it (and begin to expect it during difficult times) and that by seeing yourself through these difficult times by relying on the Crisis Team/A&E you will then begin to teach yourself how to get through these times without having to be hospitalised each time.
Right now you may not see that side of things, and that the only way to keep yourself safe is to be in hospital - but from my point of view, anything is possible inside AND out of hospital, so if you were still deadset on going through with a suicide plan while in hospital you will find anyway possible to go about it regardless. So they may not feel hospital will help you. I've often seen people in your position who have been begging to be admitted but haven't for the exact reasons i've stated - professionals are reluctant to let people become dependant on hospital because it can actually be more detrimental to your recovery.
Is there a friend/family member who is able to keep an eye on you through this difficult time? Or possibly express how you're feeling to the Crisis Team and ask for regular phonecalls/home visits - or hand over any medication/equipment you have to them which will make you feel safer atleast in the short term.
Best of Luck x
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