https://dexcom.com/en-GB/dexcom-one-plus-sample with type2 if you haven't had already can get trial 10 days. you could experiment a little with some of your favourite foods & exercise using it. think simular was suggested prior in the thread.
@Rachox has a list of price comparisons of blood glucose testers (inclusive of costs for strips) incase the surgery won't prescribe machine (cheaper than cgm for longterm) abbotts have recently (sometime in the last week) restarted their trial sensor which lasts for 15 days
https://www.freestyle.abbott/uk-en/getting-started/sampling.html 25 days of data (between those) to compare which should give pretty good insight to how various foods types effect you. would mark in exercise if wishing to go down cgm route have found shortish walks after meals helped to reduce glucose levels too. write up a 'loose' meal plan note down what worked well for you and what didn't with that could make 3 lists "worked well" 'ok on occassion" and an "avoid list".
i've fallen out with a few medical personell usually relating to bloods (due to needlephobia) and if given contradictory advice by the same DSN in the SAME week.