Thanks mrsD,
I dont know if it is important but this magnesium supplement contained citric acid. Is it possible that when I withdrawn it the body lost some acid which it was used to, although my doses were below the recommended ones? However I continued the multivitamin with a lot of B12, and I am eating foods containing B12, e.g. a lot of fishes.

I am tapering down clonazepam but its quite difficult.

I will try to check the B12 testing, but didnt find it till now in my country.

Can vitamin B12 defficiency have such extreme effects on cognitive issues as I described I have?