I think it could be either, you are getting symptoms of fluctuating blood glucose levels.
The reason could be something you still are eating that spikes you.
The other, From my own experience, those symptoms happen because your body is telling you that it doesn't like what you are doing. I believe that you have become more sensitive to above normal levels, I can feel it if I come out of ketosis.
It could be your awareness of what is happening has increased.
If these symptoms persist, go to your GP.
Keep checking your blood glucose levels.