bracelet good. Make sure she has a wallet with contact details for you and explanation of what has happened so paramedics can read it and you as emergency contact in her phone.
bus driver will be first aid trained (not that it’s their responsibility but she will get an ambulance called if she has a seizure at least)
Also you don’t just accept a 5 month wait. Call the department where she will be seen - if you know who the doctor will be call their secretary - and explain the situation and ask them nicely, but with appropriate desperation in your voice, to call you with any cancellation.
and if there is an appointment which comes up, pull both kids out of school and just get her there.
what will she be doing at college? Who will be with her? also if they said not to leave her surely you should have some kind of night time alarm? Seems a bit strange to be so worried you won’t let her take the bus and are thinking about deferring but then leave her alone at night for hours? Also she’ll be alone at college - when she goes to the loo, who will be with her? Will she be allowed to lock the door?
maybe she could do a reduced timetable and do work remotely? Like go in for after your son is dropped off?
also your husband is a dick. You being a stay at home mum doesn’t mean he just doesn’t have to put himself out. When I had my first kid my husband was working all day until late and he’d come home and do all the cleaning because I had post natal depression and was falling to pieces and wanted to help. And then he’d do night time wakings and change nappies if I didn’t wake up. And he continues this way years later even after I’m recovered.
I have also had terrible relationships in the past so I know I’ve lucked out with him so I’m really not being smug, but I really believe we women all need to realise that we don’t have to have this shitty male attitude where it’s like they live in the 40s and women just need to do everything.
If he doesn’t step up, seriously consider whether you want to be hitched to his wagon. How will he step up if you’re sick? Or can’t do anything? Plenty of better men out there.
Unless, like someone else said he’s a policeman or paramedic or something that HAS to be there, why can’t he ask his work to start a bit late?