You should just endure your symptoms and not try to combat them with sugars. At most, try a thin apple slice or an orange segment, but not much more than that. Both your symptoms sound like carb flu-type symptoms. You can get through it. Drink water and bone broth soup. Get plenty of salt. Sea salt is better than regular.
I mostly felt tired walking up stairs, felt like I couldn't engage in conversation with other people (my mind was really slow although as long as I didn't try to talk I could listen okay), I was pretty sweaty (but it was still summer) and had a lot of hot flushes during the day and in the middle of the night. I thought I was having menopause. At week 4 I had severe cramping and electrolyte problems. You lose a lot of water weight early on and with it, you lose salt and potassium. I took supplemental potassium and magnesium and licked a few salt packets off my hand and felt better. I forced myself to salt my food. Week 5 I broke through finally. It was a hard adjustment for me. But I feel fabulous now. And even a few months later I still have days where I can't believe how much more fabulous I feel than even the previous week. It just gets better and better.
Female, 5'3", 50, Starting weight: 163lbs. Current weight: 135 (more or less).
I can squat 192.5lbs, press 75lbs and deadlift 210lbs