Tracked down the source.
To my amazement I believe it was the “Organic Stevia” from my supermarket which claims to be totally organic. I think what they are calling organic erythritol in it (more than 99%) is the problem…only explanation I can come up with. I know I have no reaction to stevia or at least never did before.
I had it just twice on plain yoghurt, liked it’s taste, thought I had no side effects except woke up twice next day with the room spinning only times I ate it (days apart) same waking with extreme dizziness.
It’s the only thing I ate that is different at all and I again tried the yoghurt with walnuts and olive oil instead of the “erythritol/stevia”…no problems next day.
Posting this in case anyone else develops the same problem and can’t source it.
I think I have totally adapted with keto and am able now to enjoy savoury tastes much more than previously so plan on kcko without any sweeteners now.