Still shaky and feeling sick 40 mins later and feet are freezing ...anyone else get this effect ??
BTW I am non diabetic .
I've never had that reaction, no.
But some people do have problems adjusting to switching to low carb.
I would slow things down. Make the transition more gently.
It takes much longer for the body to digest fats than carbs. So you may be experiencing a sort of 'gap' when your body it expecting energy from the carbs, but the butter energy has not yet kicked in.
Have you heard of 'low carb flu'. Try googling it and see if you feel the symptoms match.
The answer is to drink masses, be gentle with yourself. Allow your body to transition into using a different fuel source.
Just a thought: are you sweetening your coffee with an artificial sweetener with xylitol or another polyol?
They can cause some 'gastrointestinal side effects' if used n excess, or if you are not used to them.