Hi Heather
You need a new GP! It sounds like your D nurse is talking more sense so listen to her. Unfortunately you do need a GP to prescribe your medications, could you perhaps ask to see a different one, or change practices?
Reducing carbs will help a little as they are what make your blood sugars go up, so of you eat less of them then your sugars can't go up so high. I wouldn't try to cut them out altogether, thst's far too extreme, but if you can eat less carbs and fill up with more protein and veg instead then it will help.
Hope it all starts to settle down soon, your head is in a whirl at the moment, it does get easier with time x
Oh and please do ask to get tested for T1, I'm less familiar with T2 but know a couple of people with it who had hardly any symptoms at all prior to diagnosis. If you are losing weight, are exhausted and have ketones then that sounds more like T1 to me. (The older you are at onset, the slower it is I believe, so you might not become critical as quickly as my daughter did.). But of course I can't diagnose so please do find a doctor who will listen to you and find out exactly what is going on, you need to get onto the correct course of treatment as quickly as possible then you will feel loads better. Your current GP is worse than useless.