BUT if you are trying to lose weight, do go easy on the carbs. A few carbs can make a shocking difference in weight loss, at least for me! Keep them at least below 100. Once you have lost the fat you need to lose, you can eat a few more. The occasional potato, coconut water and a little fruit stopped my weight loss in its tracks for 3 months.
I am getting back on path after being forced to because my insulin is all messed up.
Anyway, the doctor warned me that I would feel really bad the first 4-5 days while my insulin was still spiking & plummeting, and that it would take another 2-4 weeks for my body to really realize it wasn't going to be fed sugar/extra carbs & to stop trying to store fat, etc.
In your case, you might have been in early insulin resistance and your body is still adjusting. Your insulin could still be going too high & too low.
Whatever you do, keep it up! Give it 30 days. Try eating more often to stabilize it. I have had to do this for my particular case, and I'm finding that for ME (because we are all different!) this works SO much better than when I was trying to do Paleo with IF and infrequent eating. I'm not getting cranky or craving sugar. Basically, I plan the next small meal/snack and I eat before I get hungry - so before I can even think about having to use willpower, I'm already satisfied & not craving anything. No shaky feelings or nausea, etc. It seemed like I just couldn't adjust last time - and now after only 3 days I feel SO much better. Three hours between meals is my absolute max.
I can't say what will work for you, but don't assume you should be fasting just because it worked for someone else. We all have different health & body chemistry.