Hi Rose and welcome to the forum 🙂
Have you been given any medication or are you trying diet and exercise first?
Are you testing your BG at home? I wouldn't say "can" and "can't" eat, we all tolerate things differently and different amounts of things, this is where self testing can prove very useful, by testing before eating and then again 2 hours after you could build your own diary of "safe" foods, ideally 2 hours post meal you'd be looking for no more than a 2-3 mmol rise, if its more then it doesn't necessarily mean you have to cut it out, try a smaller portion first, add fat and protein to it then if you still can't get it to work then maybe look at limiting how many times you have it etc
If you have any specific questions then please do feel free to ask them, we're a friendly supportive bunch with lots of knowledge between us 🙂
xx