I wish I had documented more my first few months, as there were lots of what I would call sensations; had I not been so sick I might have stopped the protocol, but fear drove me on. So glad I pushed through.
It could be as
@bulkbiker says an electrolyte issue, especially as you are weeing alot. I would try the lo-salt brand, available in at Tesco's and other places, as it has good ratios of sodium and potassium, I just added to taste (I trusted that my hypertension would not get worse, and it improved with all of the low carb lifestyle changes).
You could be having oxalate dumping, or be going through fat adaptation. I believe in a holistic view of fixing diabetes, so would pay attention to detail. I would remove the xylitol and pepsi max; if I had to replace with something else then I would either try stevia in place xylitol, pepsi max with sparkling water, either plain or with lemon / lime. What are your number 2's like, are they lose, frothy. Is your eyesight ok / focus changing.