Nursing diploma after BSc?

I have successfully completed a degree in Biology and now I want to do a diploma in Nursing in London to get a bit “more vocational” – anyway I’m accepted and everything but I need to pass a health clearance. I have mild Epilepsy will this exclude me?

Anyway, has anyone done such a diploma and is it very difficult? Is it weird to be like 25 when you finish all your Uni stuff?

Also,