Muleman,
I was diagnosed with a blood sugar of 392 (21.7) and an A1C of 13.1. Thanks to medication and a drastic change in diet I was able to bring my blood sugars down to a reasonable range very quickly. I experienced the same thing as you initially. Two things were going on, 1st my body was not used to being in a normal range and I felt bad. Second I have since learned that when changing over to low carb our metabolisms starts to excrete more sodium, this is the cause of the so called Atkins Flue. Many have found it useful to supplement extra salt to replace the sodium being lost, one recommendation is to drink some bullion. I sometimes wonder if this is the reason so many low carbers(including me) like bacon so much.
I would have spikes like you do if I ate any bread. I see you have bread for both breakfast and lunch. Have you tried eliminating the bread and seeing what your readings are?