You need to look at alternative roles either in the nhs or outside. Ward work is not sustainable.
I moved away from ward work while only in my mid 30s due to the fear of not being able to physically do the job in my 50s, etc. An opportunity came up, earlier than I needed it, but I jumped into a clin ed role. I know other people who have moved into the blood transfusion team, infection control, etc, those sort of roles.
Also nurses who have left the nhs and done stuff like disability assessments for people making claims, either benefit claims or insurance claims for injuries.
Other nurses who have trained as nail technicians. Someone I know is training to do Botox fillers.
I remember years ago this question was asked to an MP on question time and he said we had to stop thinking of careers for life and think about alternative roles. He mentioned B&Q which I kind of sniggered at because the impression he gave was that in their 60s everyone could just go and work there no problem. He was slightly in cloud cuckoo land because b&q will not have enough jobs for everyone in their 60s but I guess his point was that if you can't teach, be a builder, prison officer, nurse, etc think what you can do.
My advice is do it sooner rather than later. Don't wait until you're struggling or older.