Thank you so muchYes testing is a good guide as to what your body can tolerate but with the medication you are taking it does need to have some carbohydrates to work on as it is encouraging your pancreas to produce more insulin so getting the balance right will need a bit of trial and not too much error. But a general guide is around 130g carbs not just sugar per day. Basing meals on meat, fish, cheese, eggs, nuts, dairy with vegetables, salads, fruit like berries with small portions of high carb foods. There are a few things which it is a good idea to cut out completely like cakes, pastry, biscuits and sugary drinks and make sure you are careful with foods like bread, potatoes, rice, pasta, breakfast cereals.
There are plenty of menu ideas in the link which is based on a 130g per day carb intake. https://lowcarbfreshwell.com/
However you will need to go cautiously until you know how the medication is working for you.
with testing when is the best time to test at first before or after meals or both this is like a minefield for me