I think that you'll find a lot of answers in the book. Rereading and reading the WHOLE book is a really great idea. (Sorry, if you're already doing that.)

Leg cramps (and possibly aches) might be helped by supplements of magnesium/calcium. Potassium can help the low energy (use No Salt on your food) and so can about 5 more carbs daily. Choose them from the Induction menu. Eat extra cooked veggies. The fibre in them will help with the constipation. So will extra Vitamin C - try 2000 mg at first. I hope you are drinking at least 2 litres (about 64 ounces) of water daily.

I see that you are 6'1" and male, so you are likely to lose rather quickly. Your stats show 9 pounds in 8 days at least. In the Rules of Induction, Atkins talks about 'losing too fast' which brings on some of the symptoms you describe.

Hope you feel better soon. You are already feeling lighter.