Protein typically has no impact on your blood glucose levels. Carbohydrates are the main culprits for negatively affecting your glucose values.
Carbohydrate content in foods is displayed on the packaging. Have a Google for information on reading these charts, it's straightforward once you get used to the layout.
MyProtein have various different whey protein shakes for sale which have zero carb content. If you do go down the protein shake route, that is.
Grant