Welcome to the forum
Sorry the hear about your heart attack but by making some lifestyle changes now it will be overall benefit to your health.
Your diagnosis will have come about as a result of an Hba1C test which if over 47mmol/mol would give you a diabetes diagnosis but how far above that will indicate how much work you will have to do. If substantially high you may have already been prescribed medication but dietary changes are also going to be needed. Losing weight if you need to will also help.
Reduction in carbohydrates will be key to managing to reduce your blood glucose levels.
Have a look at this link which is a low carb approach but based on real food so should fit in with family meals.
https://lowcarbfreshwell.co.uk/
If you give a bit more information then people can make more appropriate suggestions.