Dr. Lutz (author of Life without Bread) recommends to go easy on the diet particularly during the first couple of weeks. Considering that we are changing not only the fuel but also the way we have been processing it, it will likely take a while before full adaptation is achieved.
I don't know your age, but it is also mentioned in the book that people beyond 45 years should start somewhere between 8 to 10 bread units, which is equivalent to 96 to 120g of carbs per day, and then gradually decrease. Basically, the older the longer it will take to adapt.
I am below 45 and even though it is mentioned that younger people are likely to adapt within days or a few weeks, it took me more then a month, perhaps even 2 to adapt. I felt fatigued, with difficulty to concentrate, my legs felt incredibly heavy and I kept having leg cramps, something I had never had before. I'm usually very fit, but it got to a point that I was walking so slowly because I just couldn't walk faster that everybody, including older people with canes (!) was passing me by on the street. Since about 2 to 3 weeks my energy levels have just skyrocketed. I find myself with so much energy it's almost ridiculous, honestly.
Leg heaviness and cramps is totally gone, lethargy and difficulty to concentrate is gone, and my mind is sharper then ever.
Life without bread really brought A LOT of things home for me. I'm beginning to understand some bowel issues I've always had and that I've always considered normal, it also explains how with high consumption carbohydrates basically start to function as a laxative, instead of the very common view that carbs are healthy for the bowels. It seems that it is exactly the opposite, it promotes permanent constipation where you find yourself dependent on carbs (as a laxative) to have daily bowel movements. Once you transition to the diet constipation is expected initially as a withdrawal symptom from the carbs, much as one would expect from withdrawing from a drug. This is exactly what has been happening to me but that has been greatly helped by increasing probiotics.