Hi and welcome. if you read around on here a bit you'll see that there's quite a lot you can do to help you manage the condition and potentially get yourself back to normal blood glucose levels. The issue with high BG is that the glucose itself can damage nerves and capilliaries, and if you're running with high levels of insulin because of the high glucose that can create other problems.
Those of us with T2 generally have a problem delaing with carbohydrate in the diet, because it is digested to glucose. When I was diagnosed five years ago I cut out almost all carb - so no pasta, bread, rice, pastry, cereal, sweety sugary things, most fruit, beer etc. Worked for me, and very quickly. I can't guarantee that it will have exactly the same effect for you, and you'll see that yourself from the various accounts on the forum. But the key thing is to find what works for you, not for someone else, even though those experiences might be a source of ideas.
I'd strongly recommend getting a glucose meter and testing before and two hours after after eating to assess how well you can handle the carb in whatever you ate. Keeping a combined food and readings diary will show you fairly quickly where the issues are. Carb will raise your blood glucose, that's a given, it happens to everyone - diabetics and non-diabetics. Where we have a problem is that we often can't clear the excess glucose out of the bloodstream quickly (ie within two hours or so) and that means that levels rise and stay elevated for long periods - which is the thing that can cause damage.
The other piece of advice is to try to forget everything you think you know about "healthy eating" - what you read on the internet, what your friends and family say, and what the NHS tells us we should be eating. Might be OK for non-diabt=etics, although I have my doubts, but definitely doesn't cater for anyone with a carb problem.
best of luck. You can ask as many questions as you want.
@JoKalsbeek - can you post your dietary thing please?