Welcome to the forum
@Pre D
Sorry to hear you have been told you are at increased risk of diabetes. Balancing multiple conditions with different needs can be really challenging, but we have several forum members who live with IBS, so you aren’t alone.
One option that might help is to begin keeping a food diary of the menu you choose that suits your IBS, just to give you an idea of your baseline carbohydrate intake.
There may be obvious things like cakes, biscuits, sweets and sugary drinks that you will want to cut out straight away, but you might be surprised how much *all* carbohydrate affects your BG levels, including rice, pasta, potatoes, bread, pastry, grains, cereals and many fruits.
Note down everything you eat and drink, along with a reasonable estimate of the total carbohydrate content in your meals and snacks - it doesn’t have to be gram-perfect, the nearest 5-10g is fine. It might sound like a bit of a faff, and will involve weighing portions, squinting at the fine print on packaging, and possibly looking up things on the internet, but it will give you a really good idea of which foods are the main sources of carbs in your current menu. Once you can see which meals or snacks are your ‘big hitters’, and where carbs might be unexpectedly lurking, the process might also suggest some likely candidates for swaps, portion reductions, or using lower carb alternatives and hopefully find ones that suit your IBS.