Hi Trevm,
All good advice from Sami, Timo and Fergus. The only thing I would add is to emphasise that you need to experiment with cutting right down on the foods that are high in carbohydrate but don't provide much else, i.e. bread, pasta, rice and potatoes. You will get all the carbs you need (plus vitamins, minerals, fibre and essential oils) from fruit, vegetables and protein and those won't send your BS rocketing like the starch foods do. But you do need to test more to see which ones work for you and which ones don't. Once you have established that, then you can cut down the tests but at the moment you need more tests not less.
You also need to be careful of the claims made by sellers of herbal remedies. Many of the herbs, such as cinnamon, gymnema sylvestre and karella do have some proven anti-diabetic properties, but their properties are frequently overstated by the sellers. For example the standard medication to reduce insulin resistance is metformin. Gymnema sylvestre also does this but you would need to eat around 2 kilos to heve the same effect as one metformin tablet! It pays to research the products before you try them and I generally find Wikipedia is a good source of information.