Hello
@MollyBolt, not sure I have much advice, but perhaps some reassurance
I assume you went to A&E because you either had symptoms that could be D or you just felt rubbish and had to get to somewhere for help. Certainly your BG of 28 is very high and keto @5+ not great either, but you are in the right (and safe) place just now. What treatment have you had so far? What are your readings now?
One immediate question I would ask is what is your HbA1c? This is the formal lab based blood test that confirms D; if your highly elevated snapshot tests are from a very short period then the HbA1c shouldn't be particularly abnormal. This test looks at glycated blood cells over the last 3 months; 3 months because as these glycated cells age they are moved out of your blood by normal metabolic processes. If you've had elevated BG for a longer time, that will show up in the HbA1c result; anything above 47 mmol/L, is the UK diabetes threshold. Knowing that figure will tell you and the medics how much work needs to be done to improve and recover the situation.
Otherwise make yourself a hasty written list of those questions that are bouncing around in your mind; doing that will at least give you some structure to cling to. Many of us often lose track of what to say / do / ask at such times; we can become like rabbits in headlights and freeze (feeling stupid prhaps).
There is plenty within this Forum to look at. Personally I would say Google can be very useful for all sorts of research, but right now Diabetes UK as the sponsor of this independent Forum is a genuine and competent place to find answers for UK patients. Other nations may be just as "correct" in their various and conflicting interpretations of D, but in the final analysis right now you need to know the NHS position because that's the treatment you are getting.
Good luck, let us know how you get on.