Just listened to a segment on BBC inside science a few mins ago, about blood sugars, and how they spike after eating certain foods.
One thing that the chap mentioned was if he exercised after eating, his blood sugars didn't spike so much, so maybe that's something to take away for your new regime. Blood glucose monitors can be got for both types of diabetes, so maybe look into one of those. My gardener has one, and he can tell very quickly when he needs to do something. Saves having to do the pricked finger test and wait for results to show up. Which once nessasitated me rushing around to get him some sugary items to bring him back to normal as he all but collapsed on me. Doesn't happen now he has the monitor.
I realise that may not be your type of diabetes but I think
It would help you ascertain what foods were tricky for you that you need to avoid, and help you manage things better.
Good luck getting things under control. A change of diet can take a bit of getting used to so anything that might help has gotta be a good idea.
Your doc might be able to advise on if you can get one on the NHS (good luck!) Or at least which one to get.
Yes, exercise helps - as does losing weight, and of course taking your medication(s), but there is no cure for diabetes (yet), and these steps merely help you mitigate the condition you have so you can live longer and not get any complications. If you have T2 diabetes, you can't just eat like a non-T2 diabetic and mitigate it by exercising, or eating fibre/fat before or with your meal.
There aren't different continuous glucose monitors for different types of diabetics. They are all the same (there are a few companies that make them) - they measure your blood glucose continuously. How you use the data it provides, does vary between T1 (insulin dependent) and T2 diabetics. I'm T2 and wearing one now. Quite an eye opener to see how what I eat, and what I do affects my blood glucose during the day. The data is sent to my phone via bluetooth every 5 mins. Trying new things is all fine and well, but without concrete data, it is really just a guess. That's where the CGM comes into play and why it is such a game changer.
For Type 1's - the CGM can signal an alarm when it detects you are trending to go hypo (low blood sugar), but type 2 diabetics don't typically go hypo - they tend to have blood sugar which goes too high - and stays high for longer than it should. It is mostly just about keeping blood sugars in a normal range for the rest of your life as the excess blood glucose causes permanent damage to organs over the long term.