There was a scheme about 5 years ago whereby graduates with Science based degrees could apply to become "Doctor Assistant" or "Assistant Doctor" - like a PA (Pilot's Assistant) once was.
I guess Google could help - or writing to a local NHS Authority? I don't have the links but I do know about it as I mentioned to my Uni daughter.
Dare I suggest Politics? Run for MP? Or Local Council?
It may be possible to switch to Merchant Navy Deck or ETO Officer BUT normally it is a 3 year Cadetship with age limits (I was one). Times have changed and rules changed so it may be possible to study for the writtens and Orals but then you need seatime. If any of you are Yacht Masters or Day Skippers then that may be more viable - one of my Army students is doing that very thing now due to the flying issues - but he has experience on yachts.