Most of what you're worrying about you don't need to.
I had emergency surgery earlier this year. Started out a normal day, I washed, used deodorant, lotion, went for a walk and then started to feel in agonizing pain.
Within 2 hours of a doctor seeing me I was being taken into surgery that I had no idea I would be having when I woke up that day. They scraped my consent and I scrawled some papers as I was being wheeled away off my nut on drugs. I was kept waiting those two hours as I'd eaten multiple times that day, but it was still only 6 hours since my last meal at the point I went under. Id been drinking from a bottle of water whilst in the car being driven to hospital.
I tell you this for two reasons:
- You don't need to be so worried about food and drink and wait from the previous afternoon. Have some toast before bed, sip water when you first wake up. Don't worry about showering and grooming just don't go overboard.
- The surgeon who operated on me almost certainly was lined up to operate on someone else that day. But then I arrived, and without the surgery I had, on the day I had it, I would have died. Not could have died, would have died. I would be dead. That is the reality of hospitals, things move, plans change, priorities shift. I've had some absolutely terrible NHS experiences but the day they saved my life was insane in the best way and it really showed me that actually, for the things that are life or death, they are amazing. Sadly that is usually at the expense of being amazing at routine stuff. Id rather they be amazing at both, but id rather it be the way it is then the other way round.