I am not diabetic, very good levels and I eat carefully, but I love this site...
http://www.dlife.com/
There is so much information here, also great recipes. I get the newsletter by email.
There is a forum also.
The potatoes might have been bad for you. They spike glucose like rice and other simple carbs. I eat very few potatoes in my diet, no rice, no bread. I love oatmeal with a tsp of coconut palm sugar and cinnamon. You can test to see how that works for you. We do need carbs, but they need to be full of fiber and nutrients.
It is good you are testing. I agree, eat small meals to keep a level glucose level.
You can learn about great snacks and meals on the dilife site. Lots of great recipes online also. It is a challenge, but you can do it. Then your nerves will have a good chance to be more healthy. The brain also.