Yes I think it is normal. I read something on this site a few days ago which I think is right. The flush weakens the liver short term and strengthens it long term. After a flush (I am now on my 10th) I can feel quite off for a week or two but after that I feel a lot better,can tolerate more foods and find I am continuing my ascent to feeling really well. I do find that eating smaller meals really helps so have come to the conclusion that I must go with what my body wants. In my opinion the flushes are very effective but you need to be patient and not worry over the shortterm symptoms