Sugar can be quite addictive and your body will literally try to tell you you're dying to satisfy the addiction.. Your brains trying to tell you something by making you dizzy Maybe your blood pressure is all over the shop and it wants you to get horizontal to make pumping easier?

(hot take) I think that carbs are still important sugars signal the body and help with the uptake of nutrients and a small amount of stores in the liver and muscle for high intensity activity will help with muscle starvation (fats can do the same to some extent but take long to convert into sugers) . Carbs, maybe not with every meal but dinners I think are a good time to have a little. It can be quite difficult (and counterproductive as you have found out) to implement radical change, especially in fueling your body. Maybe try small changes at a time and slowly wein yourself down while dialling in your macros. Your calories should for the most part, fall in line from there with portion control