i started feeling exchausted and dizzy and shivering from cold. So i figured it must be calcium deficiency.
How long and how often are you IFing for? Wouldn't recommend more than 24hrs 1once per week unless you are really quite overweight....
Don't believe everything you read on the internet 
I was not eating the whole day except from drinking 2 glasses of kefir every morning five days a week. And Iwas feeling perfectly energised. Then i would return home at night, eat a big meal like 200gr of salmon and cooked brocoli of equal size with a handful of nuts for dessert. After half an hour the most i would fall asleep.
Yes, I'm slightly overweight but apart from that, it made my digestion perfect and cause i didn't tire my body with that during the day, i felt really energised. That is for the first 4 days, after that the tremor started.
Well having had some experience with blinded doctors who don't even know what they' re talking about, i figured trial and error is my only chance of health improvement and internet is a massive database for that.
That sounds more like low blood sugar than like calcium deficiency to me.
Intermittent fasting should not cause nutritional deficiencies on paleo. I can't speak to the candida diet.
I figured it must be something like calcium/magnesium deficiency cause every time i drunk kefir i immediately felt better for a while. So, you think even if i took all my calcium intake in one meal per day, i would still absorb enough? Maybe my problem was a lack of nuntrients alltogether and had nothing to do with fasting? The low blood sugar you mention, what causes it? Isn't it from fasting?
Could it be that my body isn't used to fasting, beeing an avid "eat 5-6 times a day" eater for years? I mean did paleolithic humans eat more than once per day? I really wanna solve the mystery here cause i' m not willing to give up the freedom intermittent fasting gives me.
Thanks to both for your answers.