Personally, I would refuse to see the Intermediate care team again, either just cancel my appointment or don't make one. I wouldn't bother making a fuss. It's not worth the stress. This person is clearly not knowledgable, not even open minded, and to be rude to boot, get rid of negatives in your life.
I would definitely buy a meter and, if you are computer literate or happy using apps, I would start religiously recording my testing results - personally I use a spreadsheet but there must be some good apps out there. What do people recommend? When you have a picture of what is going on, then you will feel more calm and in control.
I would definitely try LCHF - just go for it 100% and give it one month. Start easy, don't complicate matters. Have breakfast that's egg based (omelette is an easy one, or 2 hard boiled eggs with full fat mayonaise), it seems weird at first without bread, but you'll soon get used to it. Lunch, any old meat / fish / cheese with a salad and full fat dressing. Dinner, any old meat / fish with above ground veg, cauliflower, cabbage, broccoli etc. You can put butter on your veg or a creamy sauce. That will automatically give you approximately 20g daily carbs, with no weighing or measuring or stressing. No snacking, drink water and black tea and coffee (or put a spoonful of double cream in your coffee). You can follow a diet, no matter how strict, for a month! And this diet won't slow down your metabolic rate and leave you worse off than before.
In that month, you will see your readings improve virtually every day, you will probably lose weight. When you start to feel in control you can introduce a wider variety of foods, using the meter to test which foods spike you.
People can tolerate differing amounts of carbs, anything under, say, 60g a day is seen as very low carb. You may never be able to eat high carb foods again, but personally I think it's better to go 'cold turkey' - get really good improvements, then see what you can tolerate in the long term, if that's the route you want to do down, but you may discover the delights of low carb living and want to stick with it for ever, especially following some of the recipes such as those in diet doctor and yourlighterside.com
Don't be sad, be mad, get in control! Let your results speak for themselves.