So glad you were able to speak to a diabetes nurse and get a blood glucose meter, @Ruby Red - it's awful that your GP didn't organise this for you straight away when you first went to see them.
Blood sugar should be between 4 to 8, so 24.5 is very high indeed, and needs to be treated right away. Talk to the nurse about it in the morning, but if you feel worse in the meanwhile, please go in to A&E asap. I know A&E is horrible, but it really is dangerous for you to have such high blood sugar, and having any ketones at all is not good either. Ketones mean your body is unable to digest your food properly so it's breaking down your body tissue instead: https://www.diabetes.org.uk/guide-to-diabetes/complications/diabetic_ketoacidosis
At the moment your ketones aren't very high, but if they get higher (which they will if your diabetes remains untreated) you will be going to A&E in an ambulance and staying there for some time, being really seriously ill, so it's much better to go in now. Diabetes ketoacidosis is life-threatening, you really can't wait around. I know because I've been there and done that, and I ended up spending a week in hospital on an insulin pump - if I hadn't gone in when I did I might not have survived.
Having said all that, once you get some insulin (or other meds if you turn out to be type 2, but you sound much more like a type 1 to me) you will feel fantastic and there is no need for diabetes to have any major effect on your future life, so please try not to worry.
Please let us know how you get on, I for one am quite worried about you.
Thank you for the reply Juliet. It is all very scary. Especially how all of this has come on so quickly. I'm usually very well and rarely go to the Dr's!
I've just tested my blood again (before bed) and it's showing at 20.6 so it's still not good but down slightly.
Will be glad to speak to the nurse tomorrow.
Thanks again for the info
Ruby