youre much more likely to be sedated instead of restrained in this day and age.
after youve calmed down and they dont think you're an immediate threat to yourself, they might put you in what they called "1 to 1" at my hospital, which is basically you having a nurse or technician in the same room watching you 24/7. i never had to deal with it but i heard it really depends on the person whether or not "24/7" means you cant use a toilet or take a shower or change clothes without them watching you.
this was 10+ years ago, but the hospital i went to when i was young literally had padded cells theyd put kids in if they started getting violent or self-harmy. i remember thinking if it came down to it, i'd much rather just get tossed in there in complete darkness and isolation versus having some lady watch me pee for 3 days