Water fasting malnutriton?

hello, I am on my 8th day of my waterfast and want to carry on, i have had an oxo cube 2 magnesium tablets and a multivit with two teaspoons with coconut oil as my multivitamins wouldn't work neither magnesium tablets with only water.

my pre diet was 5 roast dinners and vegetables.

My problem is I am having bad water retention in my back my ankles hurt and sensitive spots on my chest and side
My side has been hurting also but little bit better after soup think it could be kidneys is this dangerous these signs should I break the fast? Tweet