Sounds like a dose of 'low carb flu', I had it and it sounds like it isn't uncommon during the first week or so of low carbing.
Your body has become so used to carbs it is a bit like an addiction so when you reduce them you can go through a bad patch for a few days as your body tries to convince you to feed the addiction. Hold out and you will feel better in another week or so. A couple of months and you might find you feel better than you have in a long time, I certainly do, more energy, more with it, more get up and go, and far less likely to want to fall a sleep in the afternoon.
I agree with the others that the rise between pre and post meal reading seems a little high, its possible there are still hidden carbs in the meals, check labels, check carb counting sites and you might have a surprise which will lead to you being able to cut them further. Bread, potatoes, rice and pasta are the obvious ones, but milk, fruit, yogurts, sauces can all contain fairly large amounts or carbs so it is worth checking further. Alternatively leave specific items out of meals one by one and you might find the culprit by elimination.